CN217156625U - Switching power supply input voltage sampling circuit, device and equipment - Google Patents
Switching power supply input voltage sampling circuit, device and equipment Download PDFInfo
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- CN217156625U CN217156625U CN202123340749.5U CN202123340749U CN217156625U CN 217156625 U CN217156625 U CN 217156625U CN 202123340749 U CN202123340749 U CN 202123340749U CN 217156625 U CN217156625 U CN 217156625U
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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 utility model discloses a switching power supply input voltage sampling circuit, device and equipment, this switching power supply input voltage sampling circuit includes: the device comprises a switch module, a sampling module and a power supply module, wherein the switch module is electrically connected with the sampling module and the power supply module respectively; the switch module is used for receiving a sampling control signal and outputting a sampling signal or a power supply signal according to a level signal of the sampling control signal; the sampling module is used for sampling the input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module; and the power supply module is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module. The sampling circuit of the input voltage of the switching power supply is simplified, and the circuit cost is reduced.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a switching power supply input voltage sampling circuit, device and equipment.
Background
At present, when a switching power supply is used for supplying power, input voltage generally needs to be sampled, and in order to ensure the reliability and the anti-interference capability of a sampling circuit, an input path and a control circuit need to be isolated. The existing sampling circuit uses a plurality of components, the circuit is complex, the circuit cost is high, and therefore how to reduce the complexity of the sampling circuit and the circuit cost becomes a technical problem to be solved urgently.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a switching power supply input voltage sampling circuit, device and equipment, aims at solving the complicated technical problem that leads to the circuit with high costs of current sampling circuit.
In order to achieve the above object, the utility model provides a switching power supply input voltage sampling circuit, switching power supply input voltage sampling circuit includes: the device comprises a switch module, a sampling module and a power supply module, wherein the switch module is electrically connected with the sampling module and the power supply module respectively;
the switch module is used for receiving a sampling control signal and outputting a sampling signal or a power supply signal according to a level signal of the sampling control signal;
the sampling module is used for sampling the input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module;
and the power supply module is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module.
Optionally, the switch module includes a primary side circuit and a transformer, and the primary side circuit is electrically connected to the transformer;
the primary side circuit is used for switching on the sampling switch to output a sampling signal when the received sampling control signal is a high-level signal;
the primary side circuit is also used for disconnecting the sampling switch to output a power supply signal when the received sampling control signal is a low level signal;
the transformer is used for transmitting the sampling signal to the sampling module and transmitting the power supply signal to the power supply module.
Optionally, the sampling module includes a sampling unit and a first protection unit, and the sampling unit is electrically connected to the first protection unit;
the sampling unit is used for sampling the input voltage of the switching power supply to obtain a sampling voltage and outputting the sampling voltage to the sampling chip when receiving the sampling signal output by the switching module;
the first protection unit is used for protecting the sampling chip.
Optionally, the primary circuit includes a field effect transistor, a first resistor, and a second resistor;
the first end of the first resistor is connected with the control chip, the second end of the first resistor is connected with the grid electrode of the field-effect tube, the first end of the second resistor is connected with the source electrode of the field-effect tube, the second end of the second resistor is grounded, and the drain electrode of the field-effect tube is connected with the second end of the primary coil of the transformer.
Optionally, the sampling unit includes a second diode, a third capacitor, a fourth resistor, a fifth resistor, and a sixth resistor;
the cathode of the second diode is connected with the first end of the secondary coil of the transformer, the anode of the second diode is connected with the first end of the third capacitor, the second end of the third capacitor is grounded, the first end of the fourth resistor is connected with the anode of the second diode, the second end of the fourth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the power supply, the first end of the sixth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is the output end of the sampling voltage.
Optionally, the first protection unit includes a third diode and a fourth capacitor, a cathode of the third diode is connected to the second end of the fourth resistor, an anode of the third diode is grounded, a first end of the fourth capacitor is connected to the first end of the fifth resistor, and a second end of the fourth capacitor is connected to an anode of the third diode.
Optionally, the power supply module includes a power supply unit and a second protection unit, and the power supply unit is electrically connected to the second protection unit;
the power supply unit is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module;
and the second protection unit is used for protecting the normal work of the power supply unit.
Optionally, the power supply unit comprises a first diode and a second capacitor; the second protection unit comprises a third resistor and a first capacitor;
the anode of the first diode is connected with the first end of the secondary coil of the transformer, the cathode of the first diode is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the secondary coil of the transformer; the first end of the third resistor is connected with the anode of the first diode, the second end of the third resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the cathode of the first diode.
In order to achieve the above object, the utility model discloses still provide a switching power supply input voltage sampling device, the device includes as above switching power supply input voltage sampling circuit.
In order to achieve the above object, the utility model discloses still provide a switching power supply input voltage sampling equipment, switching power supply input voltage sampling equipment includes as above switching power supply input voltage sampling device.
The utility model provides a switching power supply input voltage sampling circuit, switching power supply input voltage sampling circuit includes: the device comprises a switch module, a sampling module and a power supply module, wherein the switch module is electrically connected with the sampling module and the power supply module respectively; the switch module is used for receiving a sampling control signal and outputting a sampling signal or a power supply signal according to a level signal of the sampling control signal; the sampling module is used for sampling the input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module; and the power supply module is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module. Because the utility model discloses a switch module is according to sampling control signal's level signal output sampling signal or power supply signal, and sampling module is when receiving sampling signal, to the input voltage sampling of switch power supply acquisition sampling voltage, and power supply module exports power supply voltage when receiving power supply signal and for the control circuit power supply, has simplified sampling circuit, has reduced the circuit cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of a first embodiment of a switching power supply input voltage sampling circuit according to the present invention;
fig. 2 is a functional block diagram of the modules of the first embodiment of the switching power supply input voltage sampling circuit of the present invention;
fig. 3 is a schematic diagram of a circuit structure of the first embodiment of the input voltage sampling circuit of the switching power supply of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | |
| 30 | Power supply module | 101 | Primary side circuit |
| T1 | Transformer device | 201 | Sampling unit |
| 202 | A first protection unit | 301 | Power supply unit |
| 302 | Second protection unit | VCC | Input voltage of switching power supply |
| R1 | A first resistor | R2 | Second resistance |
| R3 | Third resistance | R4 | Fourth resistor |
| R5 | Fifth resistor | R6 | Sixth resistor |
| Q1 | Field effect transistor | D1 | First diode |
| D2 | Second diode | D3 | Third diode |
| D4 | Fourth diode | C1 | First capacitor |
| C2 | Second capacitor | C3 | Third capacitor |
| C4 | Fourth capacitor | VDD | Control electricitySupply voltage of circuit |
| VDD1 | Voltage of power supply | GND | Ground connection |
| INPUT/V | Sampling voltage output terminal |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a switching power supply input voltage sampling circuit.
Referring to fig. 1, in the embodiment of the present invention, the switching power supply input voltage sampling circuit includes a switching module 10, a sampling module 20, and a power supply module 30, where the switching module 10 is electrically connected to the sampling module 20 and the power supply module 30, respectively;
the switch module 10 is configured to receive a sampling control signal, and output a sampling signal or a power supply signal according to a level signal of the sampling control signal.
It is understood that the sampling control signal may be a signal for controlling the switch module to output a sampling signal or a power supply signal, and the sampling control signal includes a high level signal and a low level signal.
The sampling module 20 is configured to sample an input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module 10.
It is understood that the sampling signal may be a signal sampling the input voltage of the switching power supply; and the sampling module samples the input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module.
The power supply module 30 is configured to output a power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module 10.
It will be appreciated that the supply signal may be a signal that powers the control circuit; and when receiving the power supply signal output by the switch module, the power supply module outputs power supply voltage to supply power to the control circuit.
In the specific implementation, the switch module receives the sampling control signal, outputs a corresponding sampling signal or power supply signal according to a high level signal or a low level signal of the sampling control signal, samples the input voltage of the switch power supply to obtain a sampling voltage when the sampling module receives the sampling signal, and outputs the power supply voltage to supply power to the control circuit when the power supply module receives the power supply signal.
Further, referring to fig. 2, in order to improve the accuracy of the sampled voltage, the switching module 10 includes a primary circuit 101 and a transformer T1, wherein the primary circuit 101 is electrically connected to the transformer T1;
the primary side circuit 101 is configured to turn on a sampling switch to output a sampling signal when the received sampling control signal is a high-level signal; the primary side circuit 101 is further configured to disconnect the sampling switch to output a power supply signal when the received sampling control signal is a low level signal.
It can be understood that the primary circuit switches on the sampling switch to output the sampling signal when the received sampling control signal is a high level signal, and switches off the sampling switch to output the power supply signal when the received sampling control signal is a low level signal; wherein the sampling switch may be a field effect transistor.
The transformer T1 is used for transmitting the sampling signal to the sampling module and transmitting the power supply signal to the power supply module.
It should be understood that transformer T1 may be a flyback transformer; the sampling signal and the power supply signal output by the primary side circuit can be output to the sampling module and the power supply module.
Further, with continued reference to fig. 2, in order to avoid damaging the sampling chip due to the negative voltage output by the sampling circuit, the sampling module 20 includes a sampling unit 201 and a first protection unit 202, and the sampling unit 201 is electrically connected to the first protection unit 202;
the sampling unit 201 is configured to sample an input voltage of the switching power supply to obtain a sampling voltage and output the sampling voltage to the sampling chip when receiving the sampling signal output by the switching module; the first protection unit 202 is configured to protect the sampling chip.
It can be understood that, when receiving the sampling signal output by the switch module, the sampling unit samples the input voltage of the switch power supply to obtain a sampling voltage, and outputs the sampling voltage to the sampling chip; normally, the sampling chip receives a positive voltage, and if the chip is likely to be damaged by receiving a negative voltage, the first protection circuit can protect the sampling chip from being damaged when the sampling voltage is a negative voltage.
Further, referring to fig. 3, the primary side circuit includes a field effect transistor Q1, a first resistor R1, and a second resistor R2; the first end of the first resistor R1 is connected with a control chip, the second end of the first resistor R1 is connected with the grid electrode of the field-effect tube Q1, the first end of the second resistor R2 is connected with the source electrode of the field-effect tube Q1, the second end of the second resistor R2 is grounded, and the drain electrode of the field-effect tube Q1 is connected with the second end of the primary coil of the transformer T1.
It can be understood that the control chip outputs a sampling control signal, the first end of the primary coil of the transformer is connected with the switching power supply, when the sampling control signal output by the control chip is a high-level signal, the field-effect transistor Q1, i.e. the sampling switch, is turned on through the first resistor R1, and at this time, the primary circuit is a path to output a sampling signal; when the sampling control signal output by the control chip is a low level signal, the field effect transistor Q1, namely the sampling switch, is switched off, and a power supply signal is output; the second resistor R2 is a current-limiting resistor; assuming that the voltage of the primary coil of the transformer is Vp, the number of turns of the primary coil is Np, the voltage of the secondary coil is Vs, and the number of turns of the secondary coil is Ns, Vp/Vs is Np/Ns.
Further, with continued reference to fig. 3, in order to reduce the complexity of the sampling circuit and the circuit cost, the sampling unit 201 includes a second diode D2, a third capacitor C3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the cathode of the second diode D2 is connected to the first end of the secondary winding of the transformer T1, the anode of the second diode D2 is connected to the first end of the third capacitor C2, the second end of the third capacitor C3 is grounded, the first end of the fourth resistor R4 is connected to the anode of the second diode D2, the second end of the fourth resistor R4 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the power supply, the first end of the sixth resistor R6 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is the output end of the sampling voltage.
It can be understood that, when the sampling unit receives the sampling signal, if the voltage of the power supply is VDD1, the voltage of the secondary winding is Vs, the voltage Vs charges C3 through D2, the voltage on C3 is Vc3, Vc3 is- (Vs-a), where a is the voltage across the second diode D2, which may be 0.7V, and the third capacitor C3 is a filter capacitor; the Vc3 is divided by the R4, the R6 and the VDD1, the obtained sampling voltage is Vo ═ (R4 VDD1+ R6 Vc3)/(R4+ R6), and the sampling voltage Vo is transmitted to the sampling chip through the resistor R5; the voltage across the fet Q1 and the resistor R2 is much smaller than Vp, which can be ignored, so VCC is Vp.
It should be understood that the above relationship results in a sampled voltage Vo ═ { R4 × VDD1+ R6 (a-VCC × Ns/Np) }/(R4+ R6), and since R4, R6, Np, Ns are constants, VDD1 is a constant voltage. Therefore, the input voltage VCC of the switching power supply and the sampling voltage Vo are in a linear relation, when the input voltage of the switching power supply rises, the C3 continues to be charged, the sampling voltage Vo decreases, and a new peak value is kept unchanged after a period of time. Otherwise, the sampling voltage Vo rises, and the sampling chip calculates the value of VCC through the relation between the sampling voltage Vo and VCC to complete the sampling of the input voltage of the switch power supply; when the field effect transistor Q1 is turned off, the secondary coil of the transformer supplies power to the C2 through the D1 and supplies power to the control circuit; it cannot pass through D2, therefore, the voltage on C3 remains unchanged.
Further, with continued reference to fig. 3, to protect the sampling chip, the first protection unit 202 includes a third diode D3 and a fourth capacitor C4; a cathode of the third diode D3 is connected to the second end of the fourth resistor R4, an anode of the third diode D3 is grounded, a first end of the fourth capacitor C4 is connected to the first end of the fifth resistor R5, and a second end of the fourth capacitor C4 is connected to the anode of the third diode D3.
It is to be understood that the fourth capacitor C4 is a filter capacitor; when the sampling voltage Vo is a negative voltage, the third diode D3 is turned on, so as to avoid transmitting the negative voltage to the sampling chip, which may damage the sampling chip.
Further, with continued reference to fig. 2, in order to supply power to the control circuit after sampling the input voltage of the switching power supply, the power supply module 30 includes a power supply unit 301 and a second protection unit 302, where the power supply unit 301 is electrically connected to the second protection unit 302; the power supply unit 301 is configured to output a power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module 10; the second protection unit 302 is configured to protect the power supply unit from normal operation.
The power supply unit 301 includes a first diode D1 and a second capacitor D2; the second protection unit 302 comprises a third resistor R3 and a first capacitor C1; an anode of the first diode D1 is connected to a first end of the secondary winding of the transformer T1, a cathode of the first diode D1 is connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is connected to a second end of the secondary winding of the transformer T1; a first terminal of the third resistor R3 is connected to an anode of the first diode D1, a second terminal of the third resistor R3 is connected to a first terminal of the first capacitor C1, and a second terminal of the first capacitor C1 is connected to a cathode of the first diode D1.
It can be understood that when the fet Q1 is turned off, the secondary winding of the transformer supplies power to the C2 through the D1, and supplies power to the control circuit, which cannot pass through the D2, so that the power on the C3 remains unchanged; the third resistor R3 and the first capacitor C1 form a second protection unit, which protects the first diode D1 from working normally.
This embodiment proposes a switching power supply input voltage sampling circuit, switching power supply input voltage sampling circuit includes: the device comprises a switch module, a sampling module and a power supply module, wherein the switch module is electrically connected with the sampling module and the power supply module respectively; the switch module is used for receiving a sampling control signal and outputting a sampling signal or a power supply signal according to a level signal of the sampling control signal; the sampling module is used for sampling the input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module; and the power supply module is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module. Under the condition that only a small number of diodes, resistors and capacitors are added, the input voltage of the switch point power supply is obtained by collecting the voltage of the secondary side coil of the transformer and calculating according to the turn ratio of the transformer, so that the problem of high circuit cost caused by the complexity of a sampling circuit when the input voltage of the switch power supply is sampled is solved, devices such as chips and optical couplers are not added, the transformer is not changed, the design is flexible and simple, and the cost and the space are saved.
In order to achieve the above object, the utility model discloses still provide a switching power supply input voltage sampling device, switching power supply input voltage sampling device includes as above switching power supply input voltage sampling circuit. The specific structure of the input voltage sampling circuit of the switching power supply refers to the above embodiments, and since the input voltage sampling device of the switching power supply adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated herein.
In order to achieve the above object, the utility model discloses still provide a switching power supply input voltage sampling equipment, switching power supply input voltage sampling equipment includes as above switching power supply input voltage sampling device.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A switching power supply input voltage sampling circuit, comprising: the device comprises a switch module, a sampling module and a power supply module, wherein the switch module is electrically connected with the sampling module and the power supply module respectively;
the switch module is used for receiving a sampling control signal and outputting a sampling signal or a power supply signal according to a level signal of the sampling control signal;
the sampling module is used for sampling the input voltage of the switching power supply to obtain a sampling voltage when receiving the sampling signal output by the switching module;
and the power supply module is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module.
2. The switching power supply input voltage sampling circuit of claim 1, wherein the switching module comprises a primary side circuit and a transformer, the primary side circuit being electrically connected to the transformer;
the primary side circuit is used for switching on the sampling switch to output a sampling signal when the received sampling control signal is a high-level signal;
the primary side circuit is also used for disconnecting the sampling switch to output a power supply signal when the received sampling control signal is a low level signal;
the transformer is used for transmitting the sampling signal to the sampling module and transmitting the power supply signal to the power supply module.
3. The switching power supply input voltage sampling circuit according to claim 2, wherein the sampling module includes a sampling unit and a first protection unit, the sampling unit being electrically connected to the first protection unit;
the sampling unit is used for sampling the input voltage of the switching power supply to obtain a sampling voltage and outputting the sampling voltage to the sampling chip when receiving the sampling signal output by the switching module;
the first protection unit is used for protecting the sampling chip.
4. The switching power supply input voltage sampling circuit of claim 3, wherein the primary circuit comprises a field effect transistor, a first resistor and a second resistor;
the first end of the first resistor is connected with the control chip, the second end of the first resistor is connected with the grid electrode of the field-effect tube, the first end of the second resistor is connected with the source electrode of the field-effect tube, the second end of the second resistor is grounded, and the drain electrode of the field-effect tube is connected with the second end of the primary coil of the transformer.
5. The switching power supply input voltage sampling circuit of claim 4, wherein the sampling unit comprises a second diode, a third capacitor, a fourth resistor, a fifth resistor, and a sixth resistor;
the cathode of the second diode is connected with the first end of the secondary coil of the transformer, the anode of the second diode is connected with the first end of the third capacitor, the second end of the third capacitor is grounded, the first end of the fourth resistor is connected with the anode of the second diode, the second end of the fourth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the power supply, the first end of the sixth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is the output end of the sampling voltage.
6. The switching power supply input voltage sampling circuit of claim 5, wherein the first protection unit comprises a third diode and a fourth capacitor;
the cathode of the third diode is connected with the second end of the fourth resistor, the anode of the third diode is grounded, the first end of the fourth capacitor is connected with the first end of the fifth resistor, and the second end of the fourth capacitor is connected with the anode of the third diode.
7. The switching power supply input voltage sampling circuit of claim 6, wherein the power supply module comprises a power supply unit and a second protection unit, the power supply unit being electrically connected to the second protection unit;
the power supply unit is used for outputting power supply voltage to supply power to the control circuit when receiving the power supply signal output by the switch module;
and the second protection unit is used for protecting the normal work of the power supply unit.
8. The switching power supply input voltage sampling circuit of claim 7, wherein the power supply unit comprises a first diode and a second capacitor; the second protection unit comprises a third resistor and a first capacitor;
the anode of the first diode is connected with the first end of the secondary coil of the transformer, the cathode of the first diode is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the secondary coil of the transformer; the first end of the third resistor is connected with the anode of the first diode, the second end of the third resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the cathode of the first diode.
9. A switching power supply input voltage sampling device is characterized by comprising the switching power supply input voltage sampling circuit according to any one of claims 1-8.
10. A switching power supply input voltage sampling device, characterized in that it comprises a switching power supply input voltage sampling apparatus according to claim 9.
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| CN202123340749.5U CN217156625U (en) | 2021-12-28 | 2021-12-28 | Switching power supply input voltage sampling circuit, device and equipment |
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| CN202123340749.5U CN217156625U (en) | 2021-12-28 | 2021-12-28 | Switching power supply input voltage sampling circuit, device and equipment |
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