CN218829629U - Direct current switch power supply circuit - Google Patents
Direct current switch power supply circuit Download PDFInfo
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- CN218829629U CN218829629U CN202223376938.2U CN202223376938U CN218829629U CN 218829629 U CN218829629 U CN 218829629U CN 202223376938 U CN202223376938 U CN 202223376938U CN 218829629 U CN218829629 U CN 218829629U
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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
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- 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
Abstract
The application provides a direct current switching power supply circuit, includes: the circuit comprises a primary side power conversion circuit, a sampling and control circuit, a first secondary side driving delay circuit, a second secondary side driving delay circuit, a first voltage transformation rectifying unit and a second voltage transformation rectifying unit; the primary side power conversion circuit is used for generating a power pulse signal; the sampling and control circuit is used for detecting the voltage value of the direct-current power supply switching circuit to obtain a voltage detection value, generating a secondary side synchronous switching signal according to the voltage detection value, and transmitting the secondary side synchronous switching signal to the first secondary side driving delay circuit; the first secondary side driving delay circuit is used for converting the secondary side synchronous switch signal into a first input signal and transmitting the first input signal to the first voltage transformation rectifying unit; the first voltage transformation rectifying unit is used for outputting direct-current voltage according to the power pulse signal and the first input signal. This application is through setting up secondary side drive delay circuit, adjusts the output current of vary voltage rectifier unit, realizes a plurality of vary voltage rectifier unit's the output of flow equalizing.
Description
Technical Field
The application relates to the technical field of power supply circuit control, in particular to a direct-current switch power supply circuit.
Background
With the development of science and technology, the demand of high power, high power density and high reliability power supply system is continuously increased. If a single power supply is adopted for power supply, the selection of power devices, the switching frequency and the power density are difficult to improve due to the fact that the power to be processed is large. Therefore, under the condition of increasing system power, the number of the direct-current voltage conversion modules required to be connected in parallel is increased.
For a direct current voltage source power supply module, a parallel current sharing technology is generally adopted to ensure that each parallel module shares load current uniformly. The current sharing method mainly comprises two current sharing methods of communication and non-communication between modules and two realization methods of an analog control mode and a digital control mode.
Although the droop control using output current and output voltage as control quantity can ensure response speed, the current to be controlled is easy to fluctuate due to the limitation of different sampling precision and interference caused by different module devices because of the increase of the number of modules, so that the control effect is reduced, even oscillation is generated, the system loses steady state and enters a fault protection state.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present application provide a dc switching power supply circuit, which aims to achieve current sharing among a plurality of parallel-connected voltage transformation rectifying units in a dc switching power supply.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a direct current switching power supply circuit, the circuit comprising: the primary side power conversion circuit, the sampling and control circuit, the first secondary side driving delay circuit, the second secondary side driving delay circuit, the first transformation rectifying unit and the second transformation rectifying unit;
the primary side power conversion circuit is connected with the sampling and control circuit, the first transformation rectifying unit and the second transformation rectifying unit, the sampling and control circuit is connected with the first secondary side driving delay circuit and the second secondary side driving delay circuit, the first secondary side driving delay circuit is connected with the first transformation rectifying unit, the second secondary side driving delay circuit is connected with the second transformation rectifying unit, and the first transformation rectifying unit and the second transformation rectifying unit are connected in parallel;
the primary side power conversion circuit is used for generating a power pulse signal and transmitting the power pulse signal to the first voltage transformation rectifying unit and the second voltage transformation rectifying unit;
the sampling and control circuit is used for detecting an input voltage value of the direct-current switching power supply circuit to obtain a voltage detection value, generating a secondary side synchronous switching signal according to the voltage detection value, and transmitting the secondary side synchronous switching signal to the first secondary side driving delay circuit and the second secondary side driving delay circuit;
the first secondary side driving delay circuit is used for converting the secondary side synchronous switch signal into a first input signal and transmitting the first input signal to the first voltage transformation rectifying unit;
the second secondary side driving delay circuit is used for converting the secondary side synchronous switching signal into a second input signal and transmitting the second input signal to the second voltage transformation rectifying unit;
the first voltage transformation rectifying unit is used for outputting a first direct current voltage according to the power pulse signal and the first input signal;
and the second voltage transformation and rectification unit is used for outputting a second direct current voltage according to the power pulse signal and the second input signal.
Preferably, the first voltage transformation rectifying unit comprises a transformer, a secondary synchronous rectifying tube driver and a secondary filter circuit;
the transformer is used for receiving the power pulse signal, transforming the power pulse signal and sending the transformed power pulse signal to the secondary synchronous rectifier tube;
the secondary synchronous rectifier tube driver is used for receiving the first input signal and driving the secondary synchronous rectifier tube according to the first input signal;
the secondary side synchronous rectifier tube is used for receiving the power pulse signal, rectifying the power pulse signal to obtain a processed power pulse signal and sending the processed power pulse signal to the secondary side filter circuit;
and the secondary side filter circuit is used for filtering the processed power pulse signal to obtain an output direct current voltage.
Preferably, the first secondary side driving delay circuit comprises a diode, a first resistor and a capacitor; the diode is connected with the first resistor;
the diode is used for adjusting the rising edge and the falling edge of the secondary side synchronous switch signal to obtain the first input signal;
and the capacitor is used for adjusting the time for transmitting the first input signal to the secondary synchronous rectifier tube driver.
Preferably, the first secondary side driving delay circuit further includes: the second resistor is connected with the capacitor in series, and the second resistor is connected with the diode and the first resistor in parallel;
when the rising edge of the first input signal passes through the capacitor, the second resistor is used for charging the capacitor.
Preferably, when a falling edge of the first input signal passes through the capacitor, the second resistor is used for discharging the capacitor.
Preferably, the sampling and control circuit is further configured to detect an output current of the dc switching power supply circuit, so as to obtain a current detection value.
Preferably, the sampling and control circuit is further configured to detect an output current and an output voltage of the dc switching power supply circuit, and obtain a current detection value and the voltage detection value.
The application provides a DC power switching circuit, includes: the primary side power conversion circuit, the sampling and control circuit, the first secondary side driving delay circuit, the second secondary side driving delay circuit, the first transformation rectifying unit and the second transformation rectifying unit; the primary side power conversion circuit is used for generating a power pulse signal and sending the power pulse signal to the first voltage transformation rectifying unit; the sampling and control circuit is used for detecting the voltage value of the circuit to obtain a voltage detection value, generating a secondary side synchronous switching signal according to the voltage detection value, and transmitting the secondary side synchronous switching signal to the first secondary side driving delay circuit; the first secondary side driving delay circuit is used for converting the secondary side synchronous switch signal into a first input signal and transmitting the first input signal to the first voltage transformation rectifying unit; the first transformation rectifying unit is used for outputting direct-current voltage according to the power pulse signal and the first input signal. According to the current-sharing output circuit, the secondary side driving delay circuit is arranged, the output current of the voltage transformation rectifying units is adjusted, and the current-sharing output of the voltage transformation rectifying units is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a dc power switch circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a voltage transformation rectifying unit in a dc power switching circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a secondary side driving delay circuit in a dc power switch circuit according to an embodiment of the present disclosure;
fig. 4 is a graph illustrating a change in output current of two voltage transformation rectifying units with different internal resistances according to an embodiment of the present disclosure;
fig. 5 is a diagram of a change in output current of two voltage transformation rectifying units with different internal resistances controlled by a secondary side driving delay circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic circuit diagram of a dc power switching circuit according to an embodiment of the present disclosure is shown, where the circuit may include a primary power conversion circuit 101, a sampling and control circuit 102, a first secondary driving delay circuit 103, a second secondary driving delay circuit 104, a first transformer rectifying unit 105, and a second transformer rectifying unit 106.
Specifically, the primary power conversion circuit 101 is connected to a sampling and control circuit 102, a first transformer rectifier unit 105 and a second transformer rectifier unit 106, the sampling and control circuit 102 is connected to a first secondary driving delay circuit 103 and a second secondary driving delay circuit 104, the first secondary driving delay circuit 103 is connected to the first transformer rectifier unit 105, the second secondary driving delay circuit 104 is connected to the second transformer rectifier unit 106, and the first transformer rectifier unit 105 and the second transformer rectifier unit 106 are connected in parallel.
And the primary side power conversion circuit 101 is used for generating a power pulse signal and transmitting the power pulse signal to the first transformation rectifying unit 105 and the second transformation rectifying unit 106.
And the sampling and control circuit 102 is used for detecting a voltage value of the circuit to obtain a voltage detection value, generating a secondary side synchronous switching signal according to the voltage detection value, and transmitting the secondary side synchronous switching signal to the first secondary side driving delay circuit 103 and the second secondary side driving delay circuit 104.
In a possible embodiment, the sampling and control circuit 102 is also used for detecting the voltage value and the current value of the circuit, and can only detect the current value of the circuit, and the operation mode of the sampling and control circuit can be adjusted according to actual needs, and when the sampling and control circuit 102 is used for detecting the current value of the circuit, the operation mode is the same as that when used for detecting the voltage value of the circuit.
Specifically, when the sampling and control circuit detects the output voltage and the output current of the circuit to obtain the output voltage detection value and the output current detection value, the driving signal of the switching tube of the primary side power conversion circuit and the secondary side synchronous switching signal can be generated under the feedback regulation action of a double-ring regulator in which a voltage regulator in the circuit is an outer ring and a current regulator is an inner ring. Compared with the condition of only detecting the circuit voltage, the voltage-current double-loop regulator has good dynamic characteristic and better overload current limiting function. However, the circuit voltage is detected only, and the structure is simple and the output stability is high. Therefore, the adjustment mode of the DC power switch circuit and the control circuit can be adjusted according to the actual requirement of a technician.
The first secondary side driving delay circuit 103 is configured to convert the secondary side synchronous switching signal into a first input signal, and transmit the first input signal to the first transformer rectifier unit 105.
The second secondary side driving delay circuit 104 is configured to convert the secondary side synchronous switching signal into a second input signal, and transmit the second input signal to the second transforming and rectifying unit 106.
The first transformer rectifier unit 105 is configured to output a dc voltage according to the power pulse signal and the first input signal.
And a second transforming and rectifying unit 105 for outputting a dc voltage according to the power pulse signal and the second input signal.
It can be understood that the dc power switching circuit can include more transformer rectifying units with the same specification characteristics, and the circuit can be adjusted according to actual requirements.
In the embodiment of the application, the secondary side driving delay circuit is arranged to adjust the output current of the voltage transformation rectifying units, so that the current-sharing output of the voltage transformation rectifying units is realized.
In another embodiment of the present application, a schematic circuit diagram of a transformer rectifier unit is disclosed, and as shown in fig. 2, the first transformer rectifier unit 105 includes: the synchronous rectification circuit comprises a transformer T1, a secondary synchronous rectification tube Q2, a secondary synchronous rectification tube driver 201, a filter inductor L1 and a filter capacitor C1.
Specifically, the filter inductor L1 and the filter capacitor C1 form a secondary filter circuit.
Specifically, in a dc switching power supply circuit having a plurality of voltage transformation rectifying units, the primary sides of the transformers of the respective voltage transformation rectifying units are connected in parallel, and the output ends of the secondary side filter circuits are connected in parallel.
And the transformer T1 is used for receiving the power pulse signal and sending the power pulse signal to the secondary synchronous rectifying tubes Q1 and Q2.
And the secondary synchronous rectifier tube Q1 is used for receiving the power pulse signal, rectifying the power pulse signal to obtain a processed power pulse signal and sending the processed power pulse signal to the secondary filter circuit. It is understood that the secondary synchronous rectifier Q2 and the secondary synchronous rectifier Q1 are used in the same way, and will not be described again here.
The secondary synchronous rectifier driver 201 is configured to receive a first input signal and drive the secondary synchronous rectifiers Q1 and Q2 according to the first input signal.
And the secondary side filter circuit is used for filtering the processed power pulse signal to obtain output direct-current voltage and output current so that the voltage transformation rectifying unit outputs the output direct-current voltage value.
In this embodiment, the secondary synchronous rectifier driver can control an operation mode of the secondary synchronous rectifier according to the received input signal.
In another embodiment of the present application, a circuit schematic diagram of a secondary side driving delay circuit is further disclosed, and as shown in fig. 3, the first secondary side driving delay circuit 103 includes: diode D11, first resistance R11 and second resistance R12, electric capacity C11.
In the embodiment of the present application, a transformer rectification unit as shown in fig. 2, a secondary side driving delay circuit and a transformer rectification unit are adopted. The following describes an embodiment of the present application with reference to the first secondary driving delay circuit 103 and the first transformer/rectifier unit 105 in fig. 1.
The diode D11 is connected to the first resistor R11, and the capacitor C11 is connected to the second resistor R12.
And the diode D11 is used for adjusting the rising edge and the falling edge of the secondary side synchronous switching signal to obtain a first input signal.
And the capacitor C11 is used for adjusting the time for transmitting the first input signal to the secondary side synchronous rectifier tube driver.
Specifically, the input signal of the first secondary driving delay circuit 103 is a secondary synchronous switching signal QxPWM transmitted by the sampling and control circuit 102, where x is 1 or 2, and when x is 1, it is used to indicate a secondary synchronous switching signal to be processed and then input to the secondary synchronous rectifier Q1, and when x is 2, it is used to indicate a secondary synchronous switching signal to be processed and then input to the secondary synchronous rectifier Q2, and the following meanings of x are the same. The output signal of the first secondary driving delay circuit 103 is the input signal QxDriveIN of the secondary synchronous rectifier Q1 in the first transformer rectifier unit.
Specifically, when the rising edge of QxPWM passes through the rc circuit formed by resistor R12 and capacitor C11, the rc circuit delays QxPWM so that the rising edge of QxDriveIN after processing lags behind the rising edge of QxPWM.
Specifically, when the rising edge of QxPWM passes through the resistor-capacitor circuit, the voltage of the capacitor is increased by generating a high voltage to charge the capacitor through the resistor, so that signal transmission is slowed, resulting in the rising edge of QxDriveIN lagging the rising edge of QxPWM.
Specifically, the secondary synchronous rectifier driver 201 in the first transformer rectifier 105 receives QxDriveIN, generates QxDrive from the QxDriveIN, and drives the secondary synchronous rectifiers Q1 and Q1 through the QxDrive. When the current passes through the secondary synchronous rectifier tube Q1, if QxDrive is high level, the on-resistance of the secondary synchronous rectifier tube Q1 is small, and if QxDrive is low level, the body diode inside the secondary synchronous rectifier tube Q1 is turned on, so that the on-resistance is large, that is, the secondary driving delay circuit can control the on-resistance change of the secondary synchronous rectifier tube by adjusting the delay time between QxDriveIN and QxPWM.
Specifically, the input end to the output end of the voltage transformation rectifying unit can be equivalent to a power converter with internal resistance for converting high-frequency alternating-current power into direct-current power, and the input end and the output end of each voltage transformation rectifying unit are respectively connected in parallel, so that the output current of each voltage transformation rectifying unit is related to the respective internal resistance, the output current is small when the internal resistance is large, and the internal resistance of each voltage transformation rectifying unit can be maintained at an average value by driving the delay circuit on the secondary side, so that the output current of each voltage transformation rectifying unit is equalized.
Specifically, when the falling edge of QxPWM passes through diode D11, capacitor C11 is discharged through resistor R11, so that the falling edge of QxDriveIN is nearly synchronized with the falling edge of QxPWM. In the present embodiment, the resistance value of the resistor R12 is much larger than that of the resistor R11. For example: when R11=10 ohms, R12=1 kilo-ohm, and C11=0.1 nanofarad (nF), the delay time of the rising edge of QxDriveIN is 100 nanoseconds, the delay time of the falling edge is 1 nanosecond, and the delay time of the falling edge is negligible.
In the embodiment of the present application, the secondary side driving delay circuit can further control the on-resistance change of the secondary side synchronous rectifier tube by adjusting the delay time between QxDriveIN and QxPWM, so that the impedances of the plurality of voltage transformation rectifier units are approximately equal, and in this case, the output direct-current voltages of the output currents of the plurality of voltage transformation rectifier units are approximately equal.
The regulation effect of the embodiment of the present application on two voltage transformation rectifying units with different internal resistances is described below with reference to fig. 4 and 5.
Fig. 4 is a graph showing the variation of the output current of two voltage transformation rectifying units with different internal resistances, wherein the voltage transformation rectifying unit shown in fig. 2 is adopted in this example.
The internal resistance of the first voltage transformation rectifying unit is 0.1 ohm, and the switching frequency of the first voltage transformation rectifying unit is 100 kilohertz. The internal resistance of the second voltage transformation rectifying unit is 0.2 ohm, and the switching frequency of the second voltage transformation rectifying unit is 100 kilohertz. When the first voltage transformation rectifying unit and the second voltage transformation rectifying unit output stably, the difference between the output current IO1 and the output current IO2 is 0.15 ampere.
Fig. 5 is a diagram of the output current variation of two voltage transformation rectifying units with different internal resistances controlled by a secondary side driving delay circuit, wherein the voltage transformation rectifying unit shown in fig. 2 and the secondary side driving delay circuit shown in fig. 3 are adopted in this example.
The internal resistance of the first transformation rectifying unit is 0.1 ohm, the switching frequency of the first transformation rectifying unit is 100 kilohertz, a capacitor C11 inside the first secondary driving delay circuit connected with the first transformation rectifying unit is 1nF, the resistance value of R11 is 10 ohm, and the resistance value of R12 is 100 ohm. The internal resistance of the second transformation rectifying unit is 0.2 ohm, the switching frequency is 100 kilohertz, the capacitance C11 in the second secondary side driving delay circuit connected with the second transformation rectifying unit is 1nF, the resistance value of R11 is 10 ohm, and the resistance value of R12 is 1800 ohm. When the first voltage transformation rectifying unit and the second voltage transformation rectifying unit both output stably, the difference between the output current IO1 and the output current IO2 is 0.02 ampere, compared with the difference between the output current IO1 and the output current IO2 in fig. 4, after adjustment, the difference between the output currents of the two voltage transformation rectifying units is reduced.
According to the direct-current switching power supply circuit, the conduction impedance of the voltage transformation rectifying units can be adjusted through the secondary side drive delay circuit, so that errors among output current values of the voltage transformation rectifying units in the circuit are reduced, and the effect of output current equalization of the output current values of the voltage transformation rectifying units is achieved.
For convenience of description, the above system is described with the functions divided into various modules, which are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations as the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The circuits and circuit embodiments described above are only schematic, where the units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the circuits of the various examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, circuit, or circuit that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, circuit, or circuit. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of additional like elements in the process or circuit that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. 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 application. Thus, the present application 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 (7)
1. A direct current switching power supply circuit, said circuit comprising: the circuit comprises a primary side power conversion circuit, a sampling and control circuit, a first secondary side driving delay circuit, a second secondary side driving delay circuit, a first voltage transformation rectifying unit and a second voltage transformation rectifying unit;
the primary side power conversion circuit is connected with the sampling and control circuit, the first transformation rectifying unit and the second transformation rectifying unit, the sampling and control circuit is connected with the first secondary side driving delay circuit and the second secondary side driving delay circuit, the first secondary side driving delay circuit is connected with the first transformation rectifying unit, the second secondary side driving delay circuit is connected with the second transformation rectifying unit, and the first transformation rectifying unit and the second transformation rectifying unit are connected in parallel;
the primary side power conversion circuit is used for generating a power pulse signal and transmitting the power pulse signal to the first voltage transformation rectifying unit and the second voltage transformation rectifying unit;
the sampling and control circuit is used for detecting an input voltage value of the direct-current switching power supply circuit to obtain a voltage detection value, generating a secondary side synchronous switching signal according to the voltage detection value, and transmitting the secondary side synchronous switching signal to the first secondary side driving delay circuit and the second secondary side driving delay circuit;
the first secondary side driving delay circuit is used for converting the secondary side synchronous switch signal into a first input signal and transmitting the first input signal to the first voltage transformation rectifying unit;
the second secondary side driving delay circuit is used for converting the secondary side synchronous switch signal into a second input signal and transmitting the second input signal to the second voltage transformation rectifying unit;
the first voltage transformation rectifying unit is used for outputting a first direct current voltage according to the power pulse signal and the first input signal;
and the second voltage transformation and rectification unit is used for outputting a second direct current voltage according to the power pulse signal and the second input signal.
2. The circuit of claim 1, wherein the first transformer rectifier unit comprises a transformer, a secondary synchronous rectifier driver, and a secondary filter circuit;
the transformer is used for receiving the power pulse signal, transforming the power pulse signal and sending the transformed power pulse signal to the secondary synchronous rectifier tube;
the secondary synchronous rectifier tube driver is used for receiving the first input signal and driving the secondary synchronous rectifier tube according to the first input signal;
the secondary side synchronous rectifier tube is used for receiving the power pulse signal, rectifying the power pulse signal to obtain a processed power pulse signal and sending the processed power pulse signal to the secondary side filter circuit;
and the secondary side filter circuit is used for filtering the processed power pulse signal to obtain an output direct current voltage.
3. The circuit of claim 2, wherein the first secondary drive delay circuit comprises a diode, a first resistor, and a capacitor; the diode is connected with the first resistor;
the diode is used for adjusting the rising edge and the falling edge of the secondary side synchronous switch signal to obtain the first input signal;
and the capacitor is used for adjusting the time for transmitting the first input signal to the secondary synchronous rectifier tube driver.
4. The circuit of claim 3, wherein the first secondary drive delay circuit further comprises: the second resistor is connected with the capacitor in series, and the second resistor is connected with the diode and the first resistor in parallel;
when the rising edge of the first input signal passes through the capacitor, the second resistor is used for charging the capacitor.
5. The circuit of claim 4,
and when the falling edge of the first input signal passes through the capacitor, the second resistor is used for discharging the capacitor.
6. The circuit of claim 1,
the sampling and control circuit is also used for detecting the output current of the direct current switch power supply circuit to obtain a current detection value.
7. The circuit of claim 1,
the sampling and control circuit is also used for detecting the output current and the output voltage of the direct current switch power supply circuit to obtain a current detection value and a voltage detection value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223376938.2U CN218829629U (en) | 2022-12-14 | 2022-12-14 | Direct current switch power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223376938.2U CN218829629U (en) | 2022-12-14 | 2022-12-14 | Direct current switch power supply circuit |
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| CN218829629U true CN218829629U (en) | 2023-04-07 |
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| CN202223376938.2U Active CN218829629U (en) | 2022-12-14 | 2022-12-14 | Direct current switch power supply circuit |
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