CN217935157U - Wide-voltage input constant-current charging power supply of photovoltaic shutoff device - Google Patents
Wide-voltage input constant-current charging power supply of photovoltaic shutoff device Download PDFInfo
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- CN217935157U CN217935157U CN202222043175.3U CN202222043175U CN217935157U CN 217935157 U CN217935157 U CN 217935157U CN 202222043175 U CN202222043175 U CN 202222043175U CN 217935157 U CN217935157 U CN 217935157U
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Abstract
The utility model provides a photovoltaic shutoff device's wide voltage input constant current charging source, including power management chip U4, isolation transformer T2, triode Q3, triode Q4, the resistance R22 that produces the constant current, charging capacitor C21, opto-coupler chip U6, diode D7, diode D2, diode D11, diode D12, filter capacitor C20, filter capacitor C26, inductance L2 and inductance L4; the VDD pin 3 of the power management chip U4 is activated when the charging capacitor C21 is charged until the voltage reaches the threshold voltage of 8 v. Implement the utility model discloses, the problem that current power management chip starts to burn out when the high pressure of wide voltage range input has been solved.
Description
Technical Field
The utility model relates to a photovoltaic technology field especially relates to a photovoltaic shutoff's wide voltage input constant current charging source.
Background
With the rise of new energy industry, photovoltaic panels are increasingly used. At present, a product for ensuring the use safety of a photovoltaic panel is a shutoff device, which can monitor the voltage of the photovoltaic panel, the signal voltage and the ambient temperature, and can rapidly cut off the power supply of the photovoltaic panel under abnormal conditions, so that the output voltage of the photovoltaic panel is reduced to be below a safe voltage value within a set time, and the use safety and the personal safety are ensured.
In the prior art, a power supply of the shutdown device mainly utilizes direct current generated by a photovoltaic panel as a power supply, but the photovoltaic panel output voltage has large variation with weather factors, the shutdown device is required to normally work within a range of DC 20V-DC 135V, and an isolated 1-volt voltage signal is required to be output, so that a plurality of power supply modules are required to be used due to a plurality of voltage output requirements, and the cost is increased.
To address the above issues, a power management chip is typically employed to manage multiple voltage output requirements. However, the starting voltage of the conventional power management chip is directly rectified and supplied by the auxiliary winding, but the input power range is narrow and the high-low voltage ratio is small, so that the starting only meets the requirement of low-voltage starting, but the starting is burnt when the high voltage is input in a wide voltage range.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve lies in, provides a photovoltaic shutoff's wide voltage input constant current charging source, has solved the problem that current power management chip starts to burn out when the high pressure of wide voltage range input.
In order to solve the technical problem, an embodiment of the utility model provides a wide voltage input constant current charging source of photovoltaic shutoff device, including power management chip U4, isolation transformer T2, triode Q3, triode Q4, the resistance R22 that produces the constant current, charging capacitor C21, opto-coupler chip U6, diode D7, diode D2, diode D11, diode D12, filter capacitor C20, filter capacitor C26, inductance L2 and inductance L4; wherein:
the triode Q3, the triode Q4 and the resistor R22 for generating constant current form a constant current power supply; the base electrode of the triode Q3 is connected with the collector electrode of the triode Q4 and an external photovoltaic output voltage source, the collector electrode of the triode Q3 forms a positive electrode PV + of a constant current power supply, and the emitter electrode of the triode Q3 is connected with the base electrode of the triode Q4 and one end of a resistor R22 for generating constant current; the emitter of the triode Q4 is connected with the other end of the resistor R22 generating the constant current and then forms a negative electrode PV-of the constant current power supply;
a CS pin 1 of a power management chip U4 is connected with a resistor Rcs1 for detecting current to GND, a GND pin 2 is grounded, a VDD pin 3 is connected with a charging capacitor C21, a COMP pin 4 is connected with a phototriode of an optocoupler chip U6, and SW pins 6, 7 and 8 are connected together in parallel;
the isolation transformer T2 comprises a primary coil and three secondary coils; one primary coil has a pin 1 connected with the positive electrode PV + of the constant current power supply and the negative electrode of a diode D7, and a pin 2 connected with the positive electrode of the diode D7 and SW pins 6, 7 and 8 of a power management chip U4; a pin 4 of a secondary coil is connected with the anode of a diode D11 and then connected with a charging capacitor C21 and a pin 3,5 of a VDD pin 5363 of a power management chip U4 through the cathode of the diode D11 to be connected with the cathode PV-of a constant-current power supply; the other secondary coil and the primary coil with the pins 1 and 2 form a certain transformation ratio relation to output a voltage, a pin 10 of the secondary coil is connected with the anode of the diode D2 and then connected with the inductor L2, one end of the filter capacitor C20 and the light emitting diode of the optocoupler chip U6 through the cathode of the diode D2, and a pin 9 of the secondary coil is connected with the other end of the filter capacitor C20; the other secondary coil and the primary coil with the pins 1 and 2 form a certain transformation ratio relation to output another voltage, the pin 7 of the other secondary coil is connected with the anode of the diode D12 and is connected with one end of the inductor L4 and one end of the filter capacitor C26 through the cathode of the diode D12, and the pin 6 of the other secondary coil is connected with the other end of the filter capacitor C26; the VDD pin 3 of the power management chip U4 is started when the charging capacitor C21 is charged until the voltage reaches the threshold voltage of 8 v.
The primary-secondary transformation ratio of the isolation transformer T2 is 8.
The duty ratio controlled by the COMP pin 4 of the power management chip U4 is between 10% and 80%.
The current value of the positive electrode PV + of the constant current power supply is 2mA.
Wherein, the output voltage of the external photovoltaic output voltage source is between DC20V and DC 135V.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the utility model discloses in when the output voltage of outside photovoltaic output voltage source was between DC20V ~ DC135V, power management chip U4's VDD pin 3 accessible charging capacitor C21 charges and starts when reaching threshold voltage 8 volts to the problem of burning out is started when having solved current power management chip high pressure of wide voltage range input.
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 introduced below, and 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 obtained from these drawings still belong to the scope of the present invention without inventive laboriousness.
Fig. 1 is a schematic circuit diagram of a wide voltage input constant current charging power supply of a photovoltaic shutoff device provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a wide voltage input constant current charging power supply for a photovoltaic breaker is provided, including a power management chip U4, an isolation transformer T2, a transistor Q3, a transistor Q4, a resistor R22 generating a constant current, a charging capacitor C21, an optocoupler chip U6, a diode D7, a diode D2, a diode D11, a diode D12, a filtering capacitor C20, a filtering capacitor C26, an inductor L2, and an inductor L4; wherein the content of the first and second substances,
the triode Q3, the triode Q4 and the resistor R22 for generating constant current form a constant current power supply; the base electrode of the triode Q3 is connected with the collector electrode of the triode Q4 and an external photovoltaic output voltage source, the collector electrode of the triode Q3 is formed into a constant current power supply anode PV +, and the emitter electrode of the triode Q3 is connected with the base electrode of the triode Q4 and one end of a resistor R22 for generating constant current; the emitter of the triode Q4 is connected with the other end of the resistor R22 generating the constant current and then forms a negative electrode PV-of the constant current power supply;
a CS pin 1 of a power management chip U4 is connected with a constant current power supply anode PV +, a GND pin 2 is grounded, a VDD pin 3 is connected with a charging capacitor C21, a COMP pin 4 is connected with a phototriode of an optocoupler chip U6, and SW pins 6, 7 and 8 are connected together in parallel;
the isolation transformer T2 includes two primary coils and two secondary coils; the positive end 1 of one primary coil is connected with the positive pole PV + of the constant-current power supply and the negative pole of the diode D7, and the negative end 2 is connected with the positive pole of the diode D7 and the SW pins 6, 7 and 8 of the power management chip U4; the positive end 4 of the other primary coil is connected with the positive electrode of the diode D11 and then connected with the charging capacitor C21 and the VDD pin 3 of the power management chip U4 through the negative electrode of the diode D11, and the negative end 5 is connected with the negative electrode PV-of the constant-current power supply; one secondary coil and a primary coil with a positive end 1 and a negative end 2 form a certain transformation ratio relation to output a voltage, the positive end 10 of the secondary coil is connected with the positive electrode of a diode D2 and then connected with an inductor L2, one end of a filter capacitor C20 and a light emitting diode of an optocoupler chip U4 through the negative electrode of the diode D2, and the negative end 9 of the secondary coil is connected with the other end of the filter capacitor C20; another secondary coil and the primary coil with positive terminal 4 and negative terminal 5 form a certain transformation ratio relationship to output another voltage, its positive terminal 7 is connected with positive terminal of diode D12 and connected with one end of inductor L4 and filter capacitor C26 by negative terminal of diode D12, and its negative terminal 6 is connected with filter capacitor
The other end of C26;
the VDD pin 3 of the power management chip U4 is activated when the charging capacitor C21 is charged until the voltage reaches the threshold voltage of 8 v.
The primary-secondary transformation ratio of the isolation transformer T2 is 8.
The duty ratio controlled by the COMP pin 4 of the power management chip U4 is between 10% and 80%.
Wherein the current value of the constant current power supply is 2mA.
Wherein, the output voltage of the external photovoltaic output voltage source is between DC20V and DC 135V.
The embodiment of the utility model provides an in, adopt isolation transformer T2 and power management chip U4, power chip duty cycle is between 10% -80%, and when voltage transformer's primary secondary transformation ratio was 8, guarantee that power management chip U4's VDD pin 3's voltage value is in the regulation within range, make power management chip U4 can start when the high pressure of wide voltage range input (be the output voltage of outside photovoltaic output voltage source between DC20V ~ DC135V promptly), and can not burnt out.
That is, in the input range of DC20V to DC135V, since the voltage borne by R22 is 0.7V, the current thereof is 0.7/350=2ma, and the emitter current of the transistor Q4 is extremely small, it can be considered that when the power management chip U4 is started, PV + can provide a constant current of 2mA in the full voltage range to charge the capacitor C21 of the VDD pin 3 of the power management chip U4 until the voltage thereof reaches the threshold voltage of 8V or more, and the power management chip U4 is started accordingly. Then, the isolation transformer T2 provides power to the associated auxiliary winding (the voltage value is ensured by controlling the duty ratio of PWM through COMP pin 4 of the power management chip U4), and the voltage value of the VDD pin 3 of the power management chip U4 is ensured to be within the specified range.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the utility model discloses when well outside photovoltaic output voltage source's output voltage was between DC20V ~ DC135V, power management chip U4's VDD pin 3 accessible charging capacitor C21 charges and starts when reaching threshold voltage 8 volts until voltage to the problem of burning out is started to the high pressure of having solved current power management chip wide voltage range input.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the invention, which is defined by the claims and their equivalents.
Claims (5)
1. A wide-voltage input constant-current charging power supply of a photovoltaic breaker is used for the photovoltaic breaker and is characterized by comprising a power management chip U4, an isolation transformer T2, a triode Q3, a triode Q4, a resistor R22 for generating constant current, a charging capacitor C21, an optocoupler chip U4, a diode D7, a diode D2, a diode D11, a diode D12, a filter capacitor C20, a filter capacitor C26, an inductor L2 and an inductor L4; wherein the content of the first and second substances,
the triode Q3, the triode Q4 and the resistor R22 for generating constant current form a constant current power supply; the base electrode of the triode Q3 is connected with the collector electrode of the triode Q4 and an external photovoltaic output voltage source, the collector electrode of the triode Q3 is formed into a constant current power supply anode PV +, and the emitter electrode of the triode Q3 is connected with the base electrode of the triode Q4 and one end of a resistor R22 for generating constant current; an emitting electrode of the triode Q4 is connected with the other end of the pull-down resistor R22 and then forms a negative electrode PV-of the constant current power supply;
a CS pin 1 of a power management chip U4 is connected with a resistor Rcs1 for detecting current to GND, a GND pin 2 is grounded, a VDD pin 3 is connected with a charging capacitor C21, a COMP pin 4 is connected with a phototriode of an optocoupler chip U6, and SW pins 6, 7 and 8 are connected together in parallel;
the isolation transformer T2 comprises a primary coil and three secondary coils; one primary coil has a pin 1 connected with the positive electrode PV + of the constant current power supply and the negative electrode of a diode D7, and a pin 2 connected with the positive electrode of the diode D7 and SW pins 6, 7 and 8 of a power management chip U4; a pin 4 of a secondary coil is connected with the anode of a diode D11 and then connected with a charging capacitor C21 and a pin 3,5 of a VDD pin 5363 of a power management chip U4 through the cathode of the diode D11 to be connected with the cathode PV-of a constant-current power supply; the other secondary coil and the primary coil with the pins 1 and 2 form a certain transformation ratio relation to output a voltage, a pin 10 of the secondary coil is connected with the anode of the diode D2 and then connected with the inductor L2, one end of the filter capacitor C20 and the light emitting diode of the optocoupler chip U6 through the cathode of the diode D2, and a pin 9 of the secondary coil is connected with the other end of the filter capacitor C20; the other secondary coil and the primary coil with the pins 1 and 2 form a certain transformation ratio relation to output another voltage, the pin 7 of the other secondary coil is connected with the anode of the diode D12 and is connected with one end of the inductor L4 and one end of the filter capacitor C26 through the cathode of the diode D12, and the pin 6 of the other secondary coil is connected with the other end of the filter capacitor C26; the VDD pin 3 of the power management chip U4 is activated when the charging capacitor C21 is charged until the voltage reaches the threshold voltage of 8 v.
2. The wide voltage input constant current charging power supply of the photovoltaic shutdown device as claimed in claim 1, wherein the primary-secondary transformation ratio of the isolation transformer T2 is 8.
3. The wide voltage input constant current charging power supply of the photovoltaic breaker as claimed in claim 2, wherein the duty ratio controlled by a COMP pin 4 of the power management chip U4 is between 10% and 80%.
4. The wide voltage input constant current charging power supply of the photovoltaic breaker according to claim 3, wherein a current value of the positive electrode PV + of the constant current power supply is 2mA.
5. The wide voltage input constant current charging power supply of the photovoltaic breaker as claimed in claim 4, wherein the output voltage of the external photovoltaic output voltage source is between DC20V and DC 135V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222043175.3U CN217935157U (en) | 2022-08-04 | 2022-08-04 | Wide-voltage input constant-current charging power supply of photovoltaic shutoff device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222043175.3U CN217935157U (en) | 2022-08-04 | 2022-08-04 | Wide-voltage input constant-current charging power supply of photovoltaic shutoff device |
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| Publication Number | Publication Date |
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| CN217935157U true CN217935157U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222043175.3U Active CN217935157U (en) | 2022-08-04 | 2022-08-04 | Wide-voltage input constant-current charging power supply of photovoltaic shutoff device |
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| CN (1) | CN217935157U (en) |
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- 2022-08-04 CN CN202222043175.3U patent/CN217935157U/en active Active
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Address after: 325000 Wenzhou Bridge Industrial Park, Beibeixiang Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Benyi New Energy Co.,Ltd. Address before: 325600 Daqiao Industrial Zone, beibaixiang Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG BENYI ELECTRICAL Co.,Ltd. |
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