CN111313725A - High-precision real-time alternating voltage sampling circuit and switching power supply - Google Patents
High-precision real-time alternating voltage sampling circuit and switching power supply Download PDFInfo
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- CN111313725A CN111313725A CN202010115858.8A CN202010115858A CN111313725A CN 111313725 A CN111313725 A CN 111313725A CN 202010115858 A CN202010115858 A CN 202010115858A CN 111313725 A CN111313725 A CN 111313725A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
- H02M7/1623—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
- H02M7/1626—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a high-precision real-time alternating voltage sampling circuit and a switching power supply. The power rectifying circuit is used for rectifying input alternating current into direct current and performing follow current on a sampling loop of the differential sampling circuit; the follow current compensation circuit is used for providing current compensation for the power rectification circuit when the electric equipment is in a standby mode or a low power consumption mode; the differential sampling circuit samples and divides voltage of a live wire L and a zero line N of alternating current and provides differential acquisition signals to the controller MCU; and the controller MCU carries out differential calculation on the differential acquisition signals to obtain current instantaneous voltage acquisition signals, and processes the instantaneous voltage acquisition signals by using a preset algorithm to obtain the effective value of the alternating current in the period. Differential sampling is adopted, so that the influence of ground wire potential difference and interference on sampling is avoided, and the sampling accuracy is higher; in addition, small signal compensation is carried out on the sampling continuous flow circuit, and higher sampling precision is ensured when the standby or load power of the electric equipment is low.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a high-precision real-time alternating-current voltage sampling circuit and a switching power supply.
Background
Alternating current electric equipment is very common in production and life, voltage acquisition of a plurality of alternating current electric equipment, especially AC-DC switching power supply application occasions, and one application scene is that the real-time accurate control of some switching control equipment (relays, silicon controlled rectifiers and the like) can be carried out by knowing alternating current dynamics in real time with high precision. Another application scenario is that when the alternating current is not suitable or the performance of a product is affected by the unstable and sudden change of the alternating current, the dynamic state of an alternating current power grid can be known by sampling the alternating current voltage, so that corresponding operation adjustment or protection is performed, and the product failure or working fault is avoided.
The mainstream in the prior art adopts two types of alternating voltage sampling modes: one is coupling sampling by a mutual inductor mode, the other is amplifying by a voltage division arithmetic unit, and the two can also be combined for use. The former method has delay filtering, the precision is relatively enough but the response is slow, and the application requirement cannot be met when the response to the power grid needs to be fast. The latter mode can achieve faster response, but the sampling reference ground after rectification changes, and the interference resistance is poor, so that the precision is poor.
Disclosure of Invention
The present invention provides a high-precision real-time ac voltage sampling circuit and a switching power supply, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-precision real-time alternating voltage sampling circuit is constructed and comprises a power rectifying circuit, a differential sampling circuit, a follow current compensation circuit and a controller MCU (microprogrammed control Unit), wherein a first input end and a second input end of the differential sampling circuit are respectively connected with a live wire L and a zero wire N of alternating current, and a first output end and a second output end of the differential sampling circuit are respectively connected with a first input end and a second input end of the controller MCU; the first input end and the second input end of the follow current compensation circuit are respectively connected with a live wire L and a zero wire N of alternating current; the first input end and the second input end of the power rectification circuit are respectively connected with a live wire L and a zero wire N of alternating current, the third input end of the power rectification circuit is connected with the output end of the follow current compensation circuit, and the fourth input end of the power rectification circuit is connected with the third output end of the differential sampling circuit;
the power rectifying circuit is used for rectifying input alternating current into direct current and performing follow current on a sampling loop of the differential sampling circuit; the follow current compensation circuit is used for providing current compensation for the power rectification circuit when the electric equipment is in a standby mode or a low power consumption mode; the differential sampling circuit samples and divides the voltage of a live wire L and a zero line N of alternating current and provides differential acquisition signals to the controller MCU; and the controller MCU carries out differential calculation on the differential acquisition signals to obtain current instantaneous voltage acquisition signals, and the instantaneous voltage acquisition signals are processed by using a preset algorithm to obtain the effective value of the alternating current in the period.
Further, in the high-precision real-time ac voltage sampling circuit of the present invention, the processing the instantaneous voltage acquisition signal by using a preset algorithm to obtain an effective value of ac power in a period includes: and carrying out root mean square calculation on the instantaneous voltage acquisition signals in the period to obtain the effective value of the alternating current in the period.
Further, in the high-precision real-time ac voltage sampling circuit of the present invention, the controller MCU screens the differential acquisition signals provided by the differential sampling circuit to filter out high-frequency distortion signals in the differential acquisition signals.
Further, in the high-precision real-time ac voltage sampling circuit of the present invention, the high-frequency distortion signal refers to a signal whose variation amplitude is greater than a preset amplitude in the differential acquisition signal, and the controller MCU filters out a signal whose variation amplitude is greater than the preset amplitude in the differential acquisition signal.
Further, in the high-precision real-time alternating voltage sampling circuit, the power rectifying circuit is a diode rectifying circuit BD1, the anode of a follow current tube D1 in the diode rectifying circuit BD1 is connected with the anode of a follow current tube D2, and the anode of the follow current tube D1 is connected with the output end of the follow current compensation circuit; the anode of the follow current tube D1 is grounded, and the anode of the follow current tube D1 is connected with the third output end of the differential sampling circuit.
Further, in the high-precision real-time alternating voltage sampling circuit of the present invention, the power rectification circuit further includes a capacitor C1 and a capacitor C2; two ends of the capacitor C1 are respectively connected to the first input end and the second input end of the diode rectifier circuit BD1, and two ends of the capacitor C2 are respectively connected to the first output end and the second output end of the diode rectifier circuit BD 1.
Further, in the high-precision real-time alternating voltage sampling circuit, the free-wheeling compensation circuit comprises a diode D3, a diode D4, a resistor R1 and a resistor R2;
the anode of the diode D3 is connected with the live wire L of the alternating current, and the cathode of the diode D3 is connected with the third input end of the power rectifying circuit through the resistor R1;
the anode of the diode D4 is connected with a zero line N of alternating current, and the cathode of the diode D4 is connected with the third input end of the power rectifying circuit through the resistor R2.
Further, in the high-precision real-time alternating voltage sampling circuit provided by the invention, the differential sampling circuit comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a clamp diode D5 and a clamp diode D6;
a first end of the resistor R3 is connected to a live line L of alternating current, a second end of the resistor R3 is grounded through the resistor R5, a second end of the resistor R3 is grounded through the capacitor C4, a second end of the resistor R3 is connected to a first end of the resistor R4, a second end of the resistor R4 is connected to a pin 3 of the clamping diode D5, a pin 1 of the clamping diode D5 is grounded, and a pin 2 of the clamping diode D5 is connected to a supply voltage VCC; a second end of the resistor R4 is grounded through the capacitor C3, and a second end of the resistor R4 is connected with a first input end of the controller MCU;
a first end of the resistor R6 is connected to a neutral line N of alternating current, a second end of the resistor R6 is grounded through the resistor R8, a second end of the resistor R6 is grounded through the capacitor C6, a second end of the resistor R6 is connected to a first end of the resistor R7, a second end of the resistor R7 is connected to a pin 3 of the clamping diode D6, a pin 1 of the clamping diode D6 is grounded, and a pin 2 of the clamping diode D6 is connected to a supply voltage VCC; the second end of the resistor R7 is grounded through the capacitor C5, and the second end of the resistor R7 is connected with the second input end of the controller MCU.
Further, in the high-precision real-time alternating voltage sampling circuit provided by the invention, the sampling frequency of the controller MCU is 10K.
In addition, the invention also provides a switching power supply which comprises the high-precision real-time alternating voltage sampling circuit.
The high-precision real-time alternating voltage sampling circuit and the switching power supply have the following beneficial effects: differential sampling is adopted, so that the influence of ground wire potential difference and interference on sampling is avoided, and the sampling accuracy is higher; in addition, small signal compensation is carried out on the sampling continuous flow circuit, and higher sampling precision is ensured when the standby or load power of the electric equipment is low.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a high-precision real-time ac voltage sampling circuit according to an embodiment;
FIG. 2 is a circuit diagram of a high-precision real-time AC voltage sampling circuit according to an embodiment;
fig. 3 and 4 are circuit diagrams of a differential sampling circuit in the high-precision real-time ac voltage sampling circuit.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, the high-precision real-time ac voltage sampling circuit of this embodiment includes a power rectification circuit 10, a differential sampling circuit 20, a follow current compensation circuit 30, and a controller MCU, wherein a first input end and a second input end of the differential sampling circuit 20 are respectively connected to a live line L and a zero line N of ac power, and a first output end and a second output end of the differential sampling circuit 20 are respectively connected to a first input end and a second input end of the controller MCU; a first input end and a second input end of the follow current compensation circuit 30 are respectively connected with a live wire L and a zero wire N of alternating current; the first input end and the second input end of the power rectification circuit 10 are respectively connected with a live wire L and a zero wire N of alternating current, the third input end of the power rectification circuit 10 is connected with the output end of the follow current compensation circuit 30, and the fourth input end of the power rectification circuit 10 is connected with the third output end of the differential sampling circuit 20.
The power rectifying circuit 10 is used for rectifying the input alternating current into direct current and performing continuous current on a sampling loop of the differential sampling circuit 20; the follow current compensation circuit 30 is used for providing current compensation for the power rectification circuit 10 when the electric equipment is in a standby mode or a low power consumption mode; the differential sampling circuit 20 performs sampling voltage division on a live line L and a zero line N of alternating current, and provides differential acquisition signals to the controller MCU; and the controller MCU carries out differential calculation on the differential acquisition signals to obtain current instantaneous voltage acquisition signals, and processes the instantaneous voltage acquisition signals by using a preset algorithm to obtain the effective value of the alternating current in the period.
Optionally, the processing, by using a preset algorithm, of the instantaneous voltage acquisition signal in the high-precision real-time ac voltage sampling circuit of the embodiment to obtain the effective value of the ac power in the period includes: and carrying out root mean square calculation on the instantaneous voltage acquisition signals in the period to obtain the effective value of the alternating current in the period.
The controller MCU in the high-precision real-time ac voltage sampling circuit of this embodiment screens the differential acquisition signals provided by the differential sampling circuit 20, and filters out high-frequency distortion signals in the differential acquisition signals, so as to ensure higher detection precision. The high-frequency distortion signal refers to a signal with a variable amplitude larger than a preset amplitude in the differential acquisition signal, and the controller MCU filters out a signal with a variable amplitude larger than the preset amplitude in the differential acquisition signal. It can be understood that the controller MCU can use software program to realize signal screening, does not need complex peripheral circuit, can greatly reduce circuit arrangement, and the screening accuracy of the controller MCU is higher, and is more flexible and adjustable.
Differential sampling is adopted in the embodiment, so that the influence of ground wire potential difference and interference on sampling is avoided, and the sampling accuracy is higher; in addition, small signal compensation is carried out on the sampling continuous flow circuit, and higher sampling precision is ensured when the standby or load power of the electric equipment is low.
Example 2
Referring to fig. 2 to 4, on the basis of embodiment 1, the power rectification circuit 10 in the high-precision real-time ac voltage sampling circuit of this embodiment is a diode rectification circuit BD1, the anode of a follow current tube D1 in the diode rectification circuit BD1 is connected to the anode of a follow current tube D2, and the anode of the follow current tube D1 is connected to the output end of the follow current compensation circuit 30; the anode of the freewheeling tube D1 is grounded, and the anode of the freewheeling tube D1 is connected to the third output terminal of the differential sampling circuit 20.
The power rectification circuit 10 in the high-precision real-time ac voltage sampling circuit of this embodiment further includes a capacitor C1 and a capacitor C2, wherein two ends of the capacitor C1 are respectively connected to the first input end and the second input end of the diode rectification circuit BD1, two ends of the capacitor C2 are respectively connected to the first output end and the second output end of the diode rectification circuit BD1, and the capacitor C1 and the capacitor C2 are used for filtering.
The freewheeling compensation circuit 30 in the high-precision real-time ac voltage sampling circuit of the present embodiment includes a diode D3, a diode D4, a resistor R1, and a resistor R2, wherein the anode of the diode D3 is connected to the hot line L of the ac power, and the cathode of the diode D3 is connected to the third input terminal of the power rectification circuit 10 through the resistor R1. The anode of the diode D4 is connected to the neutral line N of the alternating current, and the cathode of the diode D4 is connected to the third input end of the power rectifying circuit 10 through the resistor R2. The follow current compensation circuit 30 performs load current compensation when the electric equipment works in a standby mode or a low power consumption mode, so that the internal diode of the power rectification circuit 10 is reliably conducted, and the sampling precision in the working state is improved.
Referring to fig. 3 and 4, the differential sampling circuit 20 in the high-precision real-time ac voltage sampling circuit of this embodiment includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a clamping diode D5, and a clamping diode D6, a first end of the resistor R3 is connected to the live line L of the ac power, a second end of the resistor R3 is grounded through a resistor R5, a second end of the resistor R3 is grounded through a capacitor C4, a second end of the resistor R3 is connected to a first end of the resistor R4, a second end of the resistor R4 is connected to the pin 3 of the clamping diode D5, the pin 1 of the clamping diode D5 is grounded, and the pin 2 of the clamping diode D5 is connected to; the second end of the resistor R4 is grounded through a capacitor C3, and the second end of the resistor R4 is connected with the first input end of the controller MCU.
The first end of the resistor R6 is connected with a zero line N of alternating current, the second end of the resistor R6 is grounded through a resistor R8, the second end of the resistor R6 is grounded through a capacitor C6, the second end of the resistor R6 is connected with the first end of the resistor R7, the second end of the resistor R7 is connected with a pin 3 of a clamping diode D6, a pin 1 of a clamping diode D6 is grounded, and a pin 2 of the clamping diode D6 is connected with a power supply voltage VCC; the second end of the resistor R7 is grounded through a capacitor C5, and the second end of the resistor R7 is connected with the second input end of the controller MCU.
The present embodiment protects the controller MCU by the clamp diode D5 and the clamp diode D6.
Alternatively, in the high-precision real-time ac voltage sampling circuit of this embodiment, the sampling frequency of the controller MCU is 10K, and the sampling frequency of the controller MCU may also be adjusted according to the requirement of the detection precision.
Differential sampling is adopted in the embodiment, so that the influence of ground wire potential difference and interference on sampling is avoided, and the sampling accuracy is higher; in addition, small signal compensation is carried out on the sampling continuous flow circuit, and higher sampling precision is ensured when the standby or load power of the electric equipment is low.
Example 3
The switching power supply of the present embodiment includes the high-precision real-time ac voltage sampling circuit as described above.
In the embodiment, the differential sampling is adopted for the switching power supply, so that the influence of ground wire potential difference and interference on the sampling is avoided, and the sampling accuracy is higher; in addition, small signal compensation is carried out on the sampling continuous flow circuit, and higher sampling precision is ensured when the standby or load power of the electric equipment is low.
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 device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A high-precision real-time alternating voltage sampling circuit is characterized by comprising a power rectifying circuit (10), a differential sampling circuit (20), a follow current compensation circuit (30) and a controller MCU, wherein a first input end and a second input end of the differential sampling circuit (20) are respectively connected with a live wire L and a zero wire N of alternating current, and a first output end and a second output end of the differential sampling circuit (20) are respectively connected with a first input end and a second input end of the controller MCU; a first input end and a second input end of the follow current compensation circuit (30) are respectively connected with a live wire L and a zero wire N of alternating current; a first input end and a second input end of the power rectifying circuit (10) are respectively connected with a live wire L and a zero wire N of alternating current, a third input end of the power rectifying circuit (10) is connected with an output end of the follow current compensation circuit (30), and a fourth input end of the power rectifying circuit (10) is connected with a third output end of the differential sampling circuit (20);
the power rectifying circuit (10) is used for rectifying input alternating current into direct current and performing follow current on a sampling loop of the differential sampling circuit (20); the follow current compensation circuit (30) is used for providing current compensation for the power rectification circuit (10) when the electric equipment is in a standby mode or a low power consumption mode; the differential sampling circuit (20) samples and divides voltage of a live wire L and a zero line N of alternating current and provides differential acquisition signals to the controller MCU; and the controller MCU carries out differential calculation on the differential acquisition signals to obtain current instantaneous voltage acquisition signals, and the instantaneous voltage acquisition signals are processed by using a preset algorithm to obtain the effective value of the alternating current in the period.
2. The high accuracy real-time ac voltage sampling circuit of claim 1, wherein said processing said instantaneous voltage acquisition signal using a predetermined algorithm to obtain an ac power valid value within a cycle comprises: and carrying out root mean square calculation on the instantaneous voltage acquisition signals in the period to obtain the effective value of the alternating current in the period.
3. The high-precision real-time alternating voltage sampling circuit according to claim 1, wherein the controller MCU filters the differential acquisition signals provided by the differential sampling circuit (20) to filter out high-frequency distortion signals in the differential acquisition signals.
4. The high-precision real-time alternating voltage sampling circuit according to claim 3, wherein the high-frequency distortion signal is a signal with a variable amplitude larger than a preset amplitude in the differential acquisition signal, and the controller MCU filters out the signal with the variable amplitude larger than the preset amplitude in the differential acquisition signal.
5. The high-precision real-time alternating voltage sampling circuit according to claim 1, wherein the power rectification circuit (10) is a diode rectification circuit BD1, the anode of a follow current tube D1 in the diode rectification circuit BD1 is connected with the anode of a follow current tube D2, and the anode of the follow current tube D1 is connected with the output end of the follow current compensation circuit (30); the anode of the afterflow tube D1 is grounded, and the anode of the afterflow tube D1 is connected with the third output end of the differential sampling circuit (20).
6. The high accuracy real time ac voltage sampling circuit of claim 5, wherein the power rectification circuit (10) further comprises a capacitor C1 and a capacitor C2; two ends of the capacitor C1 are respectively connected to the first input end and the second input end of the diode rectifier circuit BD1, and two ends of the capacitor C2 are respectively connected to the first output end and the second output end of the diode rectifier circuit BD 1.
7. The high accuracy real time ac voltage sampling circuit of claim 1, wherein the free-wheeling compensation circuit (30) comprises a diode D3, a diode D4, a resistor R1, a resistor R2;
the anode of the diode D3 is connected with the live wire L of alternating current, and the cathode of the diode D3 is connected with the third input end of the power rectifying circuit (10) through the resistor R1;
the anode of the diode D4 is connected with a zero line N of alternating current, and the cathode of the diode D4 is connected with the third input end of the power rectifying circuit (10) through the resistor R2.
8. The high-precision real-time alternating voltage sampling circuit according to claim 1, wherein the differential sampling circuit (20) comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a clamp diode D5, a clamp diode D6;
a first end of the resistor R3 is connected to a live line L of alternating current, a second end of the resistor R3 is grounded through the resistor R5, a second end of the resistor R3 is grounded through the capacitor C4, a second end of the resistor R3 is connected to a first end of the resistor R4, a second end of the resistor R4 is connected to a pin 3 of the clamping diode D5, a pin 1 of the clamping diode D5 is grounded, and a pin 2 of the clamping diode D5 is connected to a supply voltage VCC; a second end of the resistor R4 is grounded through the capacitor C3, and a second end of the resistor R4 is connected with a first input end of the controller MCU;
a first end of the resistor R6 is connected to a neutral line N of alternating current, a second end of the resistor R6 is grounded through the resistor R8, a second end of the resistor R6 is grounded through the capacitor C6, a second end of the resistor R6 is connected to a first end of the resistor R7, a second end of the resistor R7 is connected to a pin 3 of the clamping diode D6, a pin 1 of the clamping diode D6 is grounded, and a pin 2 of the clamping diode D6 is connected to a supply voltage VCC; the second end of the resistor R7 is grounded through the capacitor C5, and the second end of the resistor R7 is connected with the second input end of the controller MCU.
9. The high accuracy real-time ac voltage sampling circuit of claim 1, wherein the sampling frequency of the controller MCU is 10K.
10. A switching power supply comprising a high accuracy real time ac voltage sampling circuit as claimed in any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611910A (en) * | 2020-11-30 | 2021-04-06 | 科华恒盛股份有限公司 | Battery current sampling device |
| CN112611910B (en) * | 2020-11-30 | 2024-02-06 | 科华恒盛股份有限公司 | Battery current sampling device |
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Application publication date: 20200619 |