Switching power supply circuit based on DM6205H chip

Abstract

The utility model provides a switching power supply circuit based on a DM6205H chip. The switching power supply circuit comprises the DM6205H chip, an overvoltage protection module, an anti-interference module, a short-circuit protection module, a half-wave rectification module and a voltage regulation module. The overvoltage protection module is used for providing limitation of lightning surge voltage; the anti-interference module is used for suppressing differential mode interference; the short-circuit protection module is used for short-circuit protection, surge current limiting, voltage dividing, EM I interference restraining and apparent power limiting; the half-wave rectification module is used for performing half-wave rectification on an input power supply to obtain a direct current signal; and the voltage adjusting module is used for adjusting the output voltage, so that quick starting and high efficiency can be realized, meanwhile, the circuit is low in no-load power consumption, and short-circuit or over-temperature protection can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to a switching power supply circuit based on a DM6205H chip. Background Art

[0002] With the development of science and technology, electric meters are also developing towards intelligence and integration. In order to realize the various functions of smart meters, smart meters need to communicate with various modules, such as alarm modules, wireless transmission modules, etc. At the same time, the power supply voltage in different regions overseas is also different, and the functional requirements for smart meters are also different. Based on the requirements of wide input voltage range, high power output of power supply, built-in PLC module, etc., conventional RC solutions or linear transformer solutions cannot meet these requirements. Therefore, for power supplies with low output power requirements, switching power supply circuits can be designed to achieve the above functions. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a switching power supply circuit based on the DM6205H chip, including the DM6205H chip, an overvoltage protection module, an anti-interference module, a short-circuit protection module, a half-wave rectification module and a voltage adjustment module;

[0004] The overvoltage protection module is used to limit the lightning surge voltage; the anti-interference module is used to suppress differential mode interference; the short-circuit protection module is used for short-circuit protection and to achieve surge current limiting, voltage division, EMI interference suppression and apparent power limitation; the half-wave rectification module is used to perform half-wave rectification on the input power supply into a DC signal; the voltage adjustment module is used to adjust the output voltage;

[0005] The input end of the DM6205H chip is electrically connected to the output end of the half-wave rectifier module; the input end of the half-wave rectifier module is electrically connected to the output end of the short-circuit protection module; the input end of the short-circuit protection module is electrically connected to the output end of the overvoltage protection module; the anti-interference module is connected in series in the half-wave rectifier module; the output end of the DM6205H chip is electrically connected to the input end of the voltage adjustment module.

[0006] In some embodiments of the present application, the voltage adjustment module includes a resistor RN5, capacitors CN2, CN3, CN4, CN5, an electrolytic capacitor E1, an inductor LN1, and diodes DN2 and DN3; one end of the resistor RN5 is electrically connected to the positive electrode of the diode DN2, and the other end is electrically connected to the capacitor CN5; the capacitors CN2 and CN3 are connected in parallel, one end of which is electrically connected to the VDD pin of the DM6205H chip, and the other end is electrically connected to the inductor LN1; one end of the capacitor CN4 is electrically connected to the inductor LN 1, and the other end is grounded; one end of the capacitor CN5 is electrically connected to the inductor LN1, and the other end is grounded; one end of the electrolytic capacitor E1 is electrically connected to the inductor LN1, and the other end is grounded; one end of the inductor LN1 is electrically connected to the capacitor CN2, and the other end is electrically connected to the capacitor CN5; the positive electrode of the diode DN2 is electrically connected to the resistor RN5, and the negative electrode is electrically connected to the VDD pin of the DM6205H chip; the positive electrode of the diode DN3 is grounded, and the negative electrode is electrically connected to the inductor LN1.

[0007] In some embodiments of the present application, the voltage adjustment module includes a resistor RN5, capacitors CN2, CN3, CN4, CN5, an electrolytic capacitor E1, an output module, and diodes DN2 and DN3; one end of the resistor RN5 is electrically connected to the positive electrode of the diode DN2, and the other end is electrically connected to the capacitor CN5; the capacitors CN2 and CN3 are connected in parallel, one end of which is electrically connected to the VDD pin of the DM6205H chip, and the other end is electrically connected to the output module; one end of the capacitor CN4 is electrically connected to the output module, and the other end is grounded; one end of the capacitor CN5 is electrically connected to the output module, and the other end is grounded; one end of the electrolytic capacitor E1 is electrically connected to the output module, and the other end is grounded; one end of the output module is electrically connected to the capacitor CN2, and the other end is electrically connected to the capacitor CN5; the positive electrode of the diode DN2 is electrically connected to the resistor RN5, and the negative electrode is electrically connected to the VDD pin of the DM6205H chip; the positive electrode of the diode DN3 is grounded, and the negative electrode is electrically connected to the output module.

[0008] In some embodiments of the present application, the overvoltage protection module includes a varistor RN4, one end of the varistor RN4 is electrically connected to the UN terminal, and the other end of the varistor RN4 is electrically connected to the UL terminal.

[0009] In some embodiments of the present application, the half-wave rectifier module includes a diode DN1, an inductor L1, an electrolytic capacitor EN1, an electrolytic capacitor EN2, a resistor RN3, a resistor RN6, a resistor RN7, and a resistor RN8; the positive pole of the diode DN1 is electrically connected to the output end of the short-circuit protection module, and the negative pole is electrically connected to the input end of the anti-interference module; one end of the inductor L1 is electrically connected to the input end of the anti-interference module, and the other end is electrically connected to the input end of the DM6205H chip; the resistors RN3, RN6, RN7, and RN8 are connected in series in sequence, one end of which is electrically connected to the input end of the DM6205H chip, and the other end is grounded; the electrolytic capacitors EN1 and EN2 are connected in series, one end of which is electrically connected to the input end of the DM6205H chip, and the other end is grounded.

[0010] In some embodiments of the present application, the anti-interference module includes a capacitor CN1, one end of the capacitor CN1 is electrically connected to the inductor L1, and the other end is grounded.

[0011] In some embodiments of the present application, the short-circuit protection module includes a composite thermistor RN2, the input end of the composite thermistor RN2 is electrically connected to the input end of the overvoltage protection module, the middle end is electrically connected to the input end of the half-wave rectifier module, and the output end is electrically connected to the UL end.

[0012] In some embodiments of the present application, the varistor RN4 is a plug-in varistor, and the varistor voltage is 820V.

[0013] In some embodiments of the present application, the rated voltage sensitivity value of the composite thermistor RN2 is 390 VDC.

[0014] In some embodiments of the present application, the resistors RN3, RN6, RN7, and RN8 are chip resistors with a resistance value of 2 MΩ.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects: the switching power supply circuit based on the DM6205H chip of the present application includes a DM6205H chip, an overvoltage protection module, an anti-interference module, a short-circuit protection module, a half-wave rectifier module and a voltage adjustment module; the overvoltage protection module is used to provide a limit on the lightning surge voltage; the anti-interference module is used to suppress differential mode interference; the short-circuit protection module is used for short-circuit protection and to achieve surge current limiting, voltage division, EMI interference suppression and apparent power limitation; the half-wave rectifier module is used to perform half-wave rectification on the input power supply into a DC signal; the voltage adjustment module is used to adjust the output voltage, so that fast startup and high efficiency can be achieved. At the same time, the circuit has low no-load power consumption and can achieve short-circuit or over-temperature protection.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of this document are used to provide a further understanding of this document. The exemplary embodiments and descriptions of this document are used to explain this document and do not constitute an improper limitation on this document. In the accompanying drawings:

[0018] Figure 1 is a circuit schematic diagram provided by an exemplary embodiment of the present application;

[0019] Figure 2 is a circuit schematic diagram provided by another exemplary embodiment of the present application;

[0020] Figure 3 It is a circuit schematic diagram provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0022] With the development of science and technology, electric meters are also developing towards intelligence and integration. In order to realize the various functions of smart meters, smart meters need to communicate with various modules, such as alarm modules, wireless transmission modules, etc. At the same time, the power supply voltage in different regions overseas is also different, and the functional requirements for smart meters are also different. Based on the requirements of wide input voltage range, high power output of power supply, built-in PLC module, etc., ordinary resistance-capacitance solutions or linear transformer solutions can no longer meet these requirements. Therefore, for power supplies with low output power requirements, switching power supply circuits can be designed to achieve the above functions.

[0023] Based on this, an exemplary embodiment of the present application provides a switching power supply circuit based on the DM6205H chip, which includes a DM6205H chip, an overvoltage protection module, an anti-interference module, a short-circuit protection module, a half-wave rectifier module and a voltage adjustment module; the overvoltage protection module is used to provide lightning surge voltage limitation; the anti-interference module is used to suppress differential mode interference; the short-circuit protection module is used for short-circuit protection and to achieve surge current limiting, voltage division, EMI interference suppression and apparent power limitation; the half-wave rectifier module is used to half-wave rectify the input power supply into a DC signal; the voltage adjustment module is used to adjust the output voltage, so that fast startup and high efficiency can be achieved. At the same time, the circuit has low no-load power consumption and can achieve short circuit or over-temperature protection.

[0024] An exemplary embodiment of the present application provides a switching power supply circuit based on a DM6205H chip, such as Figure 1 As shown, the switching power supply circuit includes a DM6205H chip, an overvoltage protection module, an anti-interference module, a short-circuit protection module, a half-wave rectifier module, and a voltage adjustment module. The overvoltage protection module is used to limit the lightning surge voltage; the anti-interference module is used to suppress differential mode interference; the short-circuit protection module is used for short-circuit protection and to achieve surge current limiting, voltage division, EMI interference suppression, and apparent power limitation; the half-wave rectifier module is used to perform half-wave rectification on the input power supply into a DC signal; and the voltage adjustment module is used to adjust the output voltage.

[0025] The input end of the DM6205H chip is electrically connected to the output end of the half-wave rectifier module; the input end of the half-wave rectifier module is electrically connected to the output end of the short-circuit protection module; the input end of the short-circuit protection module is electrically connected to the output end of the overvoltage protection module; the anti-interference module is connected in series in the half-wave rectifier module; the output end of the DM6205H chip is electrically connected to the input end of the voltage adjustment module.

[0026] In an exemplary embodiment, Figure 2As shown, the voltage adjustment module includes a resistor RN5, capacitors CN2, CN3, CN4, CN5, an electrolytic capacitor E1, an inductor LN1, and diodes DN2 and DN3; one end of the resistor RN5 is electrically connected to the positive electrode of the diode DN2, and the other end is electrically connected to the capacitor CN5; the capacitors CN2 and CN3 are connected in parallel, one end of which is electrically connected to the VDD pin of the DM6205H chip, and the other end is electrically connected to the inductor LN1; one end of the capacitor CN4 is electrically connected to the inductor LN1, and the other end is grounded; one end of the capacitor CN5 is electrically connected to the inductor LN1, and the other end is grounded; one end of the electrolytic capacitor E1 is electrically connected to the inductor LN1, and the other end is grounded; one end of the inductor LN1 is electrically connected to the capacitor CN2, and the other end is electrically connected to the capacitor CN5; the positive electrode of the diode DN2 is electrically connected to the resistor RN5, and the negative electrode is electrically connected to the VDD pin of the DM6205H chip; the positive electrode of the diode DN3 is grounded, and the negative electrode is electrically connected to the inductor LN1. At this time, the power supply circuit is a non-isolated circuit, which is suitable for situations where there is no isolation requirement such as 485.

[0027] In an exemplary embodiment, Figure 3 As shown, the voltage adjustment module includes a resistor RN5, capacitors CN2, CN3, CN4, CN5, an electrolytic capacitor E1, an output module, and diodes DN2 and DN3; one end of the resistor RN5 is electrically connected to the positive electrode of the diode DN2, and the other end is electrically connected to the capacitor CN5; the capacitors CN2 and CN3 are connected in parallel, one end of which is electrically connected to the VDD pin of the DM6205H chip, and the other end is electrically connected to the output module; one end of the capacitor CN4 is electrically connected to the output module, and the other end is grounded; one end of the capacitor CN5 is electrically connected to the output module, and the other end is grounded; one end of the electrolytic capacitor E1 is electrically connected to the output module, and the other end is grounded; one end of the output module is electrically connected to the capacitor CN2, and the other end is electrically connected to the capacitor CN5; the positive electrode of the diode DN2 is electrically connected to the resistor RN5, and the negative electrode is electrically connected to the VDD pin of the DM6205H chip; the positive electrode of the diode DN3 is grounded, and the negative electrode is electrically connected to the output module. The output module includes transformer TRN1, diode DN4, capacitor CN6, and electrolytic capacitor EN3. The primary side of transformer TRN1 is connected to HVDD and the GND pin of the DM6205H chip. The secondary side of transformer TRN1 passes through the rectifier diode DN4 and then through the capacitor CN6 and electrolytic capacitor EN3 to form the second output OUT. Diode DN4 plays a role of rectification, and CN6 and EN3 play a role of filtering. At this time, the second output OUT is isolated from the first output HVDD after passing through the transformer TRN1. The power supply circuit is an isolation circuit and is suitable for situations where there are isolation requirements such as 485. According to different working conditions, the power supply circuit can realize the switching of the meter between the isolation circuit and the non-isolation circuit scheme.

[0028] The overvoltage protection module includes a varistor RN4, one end of the varistor RN4 is electrically connected to the UN terminal, and the other end of the varistor RN4 is electrically connected to the UL terminal.

[0029] The half-wave rectifier module includes a diode DN1, an inductor L1, an electrolytic capacitor EN1, an electrolytic capacitor EN2, a resistor RN3, a resistor RN6, a resistor RN7, and a resistor RN8; the positive pole of the diode DN1 is electrically connected to the output end of the short-circuit protection module, and the negative pole is electrically connected to the input end of the anti-interference module; one end of the inductor L1 is electrically connected to the input end of the anti-interference module, and the other end is electrically connected to the input end of the DM6205H chip; resistors RN3, RN6, RN7, and RN8 are connected in series in sequence, one end of which is electrically connected to the input end of the DM6205H chip, and the other end is grounded; electrolytic capacitors EN1 and EN2 are connected in series, one end of which is electrically connected to the input end of the DM6205H chip, and the other end is grounded.

[0030] The anti-interference module includes a capacitor CN1 , one end of the capacitor CN1 is electrically connected to the inductor L1 , and the other end of the capacitor CN1 is grounded.

[0031] The short-circuit protection module includes a composite thermistor RN2, an input end of the composite thermistor RN2 is electrically connected to an input end of the overvoltage protection module, a middle end is electrically connected to an input end of the half-wave rectifier module, and an output end is electrically connected to a UL end.

[0032] In an exemplary embodiment, the parameters of each component are as follows:

[0033] The varistor RN4 is a plug-in varistor with a varistor voltage of 820V.

[0034] The rated varistor value of the composite thermistor RN2 is 390VDC.

[0035] Resistors RN3, RN6, RN7, and RN8 are chip resistors with a resistance value of 2 MΩ.

[0036] Diode DN1 is a rectifier diode with a maximum peak reverse voltage of 2000V.

[0037] Capacitor CN1 is a safety capacitor with a capacity of 0.1uF.

[0038] Inductor L1 is a winding inductor with an inductance of 4.7mH.

[0039] The electrolytic capacitors EN1 and EN2 are aluminum electrolytic capacitors with a capacity of 18uF.

[0040] The DM6205H chip is an AC-DC chip with a built-in 800V MOS tube.

[0041] Capacitor CN2 is a chip ceramic capacitor with a capacity of 1uF.

[0042] Capacitor CN3 is a chip ceramic capacitor with a capacity of 100nF.

[0043] Diode DN2 is a rectifier diode with a maximum peak reverse voltage of 1000V.

[0044] Resistor RN5 is a chip resistor with a resistance of 22Ω.

[0045] Inductor LN1 is a winding inductor with an inductance of 220uF.

[0046] Capacitor CN4 is a chip ceramic capacitor with a capacity of 10pF.

[0047] Diode DN3 is a chip diode with a maximum peak reverse voltage of 1000V.

[0048] Capacitor CN5 is a chip ceramic capacitor with a capacitance of 10uF.

[0049] The electrolytic capacitor E1 is an aluminum electrolytic capacitor with a capacity of 100uF.

[0050] The working principle of the switching power supply circuit based on the DM6205H chip is as follows: the AC voltage is input from one end of the varistor RN4, the composite thermistor RN2 can realize short-circuit protection and surge current limiting, voltage division, EMI interference suppression and apparent power limitation to protect the circuit, and the capacitor CN1 can suppress differential mode interference; then, under the action of the half-wave rectifier module, the input AC power is half-wave rectified into a DC signal, input to the DM6205H chip, and finally output a voltage that meets the requirements through the voltage adjustment module.

[0051] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the article or device comprising the elements.

[0052] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0053] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the intention of the present application also includes these modifications and variations.

Claims

1. A switching power supply circuit based on DM6205H chip, characterized in that: Including DM6205H chip, overvoltage protection module, anti-interference module, short-circuit protection module, half-wave rectification module and voltage adjustment module; The overvoltage protection module is used to limit the lightning surge voltage; the anti-interference module is used to suppress differential mode interference; the short-circuit protection module is used for short-circuit protection and to achieve surge current limiting, voltage division, EMI interference suppression and apparent power limitation; the half-wave rectification module is used to perform half-wave rectification on the input power supply into a DC signal; the voltage adjustment module is used to adjust the output voltage; The input end of the DM6205H chip is electrically connected to the output end of the half-wave rectifier module; the input end of the half-wave rectifier module is electrically connected to the output end of the short-circuit protection module; the input end of the short-circuit protection module is electrically connected to the output end of the overvoltage protection module; the anti-interference module is connected in series in the half-wave rectifier module; the output end of the DM6205H chip is electrically connected to the input end of the voltage adjustment module.

2. The switching power supply circuit based on the DM6205H chip according to claim 1, characterized in that: The voltage adjustment module includes a resistor RN5, capacitors CN2, CN3, CN4, CN5, an electrolytic capacitor E1, an inductor LN1, and diodes DN2 and DN3; one end of the resistor RN5 is electrically connected to the positive electrode of the diode DN2, and the other end is electrically connected to the capacitor CN5; the capacitors CN2 and CN3 are connected in parallel, one end of which is electrically connected to the VDD pin of the DM6205H chip, and the other end is electrically connected to the inductor LN1; one end of the capacitor CN4 is electrically connected to the inductor LN1 , and the other end is grounded; one end of the capacitor CN5 is electrically connected to the inductor LN1, and the other end is grounded; one end of the electrolytic capacitor E1 is electrically connected to the inductor LN1, and the other end is grounded; one end of the inductor LN1 is electrically connected to the capacitor CN2, and the other end is electrically connected to the capacitor CN5; the positive electrode of the diode DN2 is electrically connected to the resistor RN5, and the negative electrode is electrically connected to the VDD pin of the DM6205H chip; the positive electrode of the diode DN3 is grounded, and the negative electrode is electrically connected to the inductor LN1.

3. The switching power supply circuit based on the DM6205H chip according to claim 1, characterized in that: The voltage adjustment module includes a resistor RN5, capacitors CN2, CN3, CN4, CN5, an electrolytic capacitor E1, an output module, and diodes DN2 and DN3; one end of the resistor RN5 is electrically connected to the positive electrode of the diode DN2, and the other end is electrically connected to the capacitor CN5; the capacitors CN2 and CN3 are connected in parallel, one end of which is electrically connected to the VDD pin of the DM6205H chip, and the other end is electrically connected to the output module; one end of the capacitor CN4 is electrically connected to the output module, and the other end is grounded; one end of the capacitor CN5 is electrically connected to the output module, and the other end is grounded; one end of the electrolytic capacitor E1 is electrically connected to the output module, and the other end is grounded; one end of the output module is electrically connected to the capacitor CN2, and the other end is electrically connected to the capacitor CN5; the positive electrode of the diode DN2 is electrically connected to the resistor RN5, and the negative electrode is electrically connected to the VDD pin of the DM6205H chip; the positive electrode of the diode DN3 is grounded, and the negative electrode is electrically connected to the output module.

4. The switching power supply circuit based on the DM6205H chip according to claim 1, characterized in that: The overvoltage protection module includes a varistor RN4, one end of the varistor RN4 is electrically connected to the UN terminal, and the other end of the varistor RN4 is electrically connected to the UL terminal.

5. The switching power supply circuit based on the DM6205H chip according to claim 1, characterized in that: The half-wave rectifier module includes a diode DN1, an inductor L1, an electrolytic capacitor EN1, an electrolytic capacitor EN2, a resistor RN3, a resistor RN6, a resistor RN7, and a resistor RN8; the positive electrode of the diode DN1 is electrically connected to the output end of the short-circuit protection module, and the negative electrode is electrically connected to the input end of the anti-interference module; one end of the inductor L1 is electrically connected to the input end of the anti-interference module, and the other end is electrically connected to the input end of the DM6205H chip; the resistors RN3, RN6, RN7, and RN8 are connected in series in sequence, one end of which is electrically connected to the input end of the DM6205H chip, and the other end is grounded; the electrolytic capacitors EN1 and EN2 are connected in series, one end of which is electrically connected to the input end of the DM6205H chip, and the other end is grounded.

6. The switching power supply circuit based on the DM6205H chip according to claim 1, characterized in that: The anti-interference module includes a capacitor CN1 , one end of the capacitor CN1 is electrically connected to the inductor L1 , and the other end of the capacitor CN1 is grounded.

7. The switching power supply circuit based on the DM6205H chip according to claim 1, characterized in that: The short-circuit protection module includes a composite thermistor RN2, an input end of the composite thermistor RN2 is electrically connected to an input end of the overvoltage protection module, a middle end is electrically connected to an input end of the half-wave rectifier module, and an output end is electrically connected to a UL end.

8. The switching power supply circuit based on the DM6205H chip according to claim 4 is characterized in that: The varistor RN4 is a plug-in varistor with a varistor voltage of 820V.

9. The switching power supply circuit based on the DM6205H chip according to claim 7, characterized in that: The rated varistor value of the composite thermistor RN2 is 390 VDC.

10. The switching power supply circuit based on the DM6205H chip according to claim 5, characterized in that: The resistors RN3, RN6, RN7 and RN8 are chip resistors, and the resistance value is 2 MΩ.

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