CN215420061U - Circuit for widening power supply input working voltage range - Google Patents

Circuit for widening power supply input working voltage range Download PDF

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Publication number
CN215420061U
CN215420061U CN202120053780.1U CN202120053780U CN215420061U CN 215420061 U CN215420061 U CN 215420061U CN 202120053780 U CN202120053780 U CN 202120053780U CN 215420061 U CN215420061 U CN 215420061U
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voltage
circuit
resistor
input
power supply
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CN202120053780.1U
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刘晓刚
张耀国
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Huizhou Xinsibeike Power Technology Co ltd
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Huizhou Xinsibeike Power Technology Co ltd
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Abstract

The utility model provides a circuit for widening the input working voltage range of a power supply, wherein input sampling is an input voltage detection pin of the power supply, the input sampling voltage is lower than a lower limit voltage Vrefmin or higher than an upper limit voltage Vrefmax, the power supply is in a protection state and has no output, the lower limit voltage Vrefmin and the upper limit voltage Vrefmax are well defined when a power supply control chip is developed, wherein the input sampling is connected with a widening voltage circuit in parallel, the widening voltage circuit comprises a divider resistor and a voltage stabilizing element connected with the divider resistor in series, and the threshold voltage of the voltage stabilizing element is set as follows: between the lower voltage Vrefmin and the upper voltage Vrefmax of the chip. The voltage stabilizing element is not conducted when the input sampling voltage is smaller than the threshold voltage of the voltage stabilizing element, and is conducted when the input sampling voltage is larger than the threshold voltage of the voltage stabilizing element, so that the working voltage range of the chip is widened. The voltage-broadening circuit is safe and reliable, low in cost and convenient to use. The utility model is widely applied to power supplies of power grids or power supplies with wide input voltage.

Description

Circuit for widening power supply input working voltage range
Technical Field
The utility model relates to the technical field of chips for power supplies of power grids, in particular to a circuit for widening the input working voltage range of a power supply.
Background
At present, the working voltage range of the power supply of the power grid in the market depends on the power supply control chip, and if the power supply is required to work at a higher working voltage, only the chip which supports the power supply to work in a wider input voltage range can be replaced.
This brings about the disadvantages that: there is no choice as to the chip that supports the power supply to operate in a wider input voltage range, or even if the chip is chosen to support the power supply to operate in a wider input voltage range, there may be a mismatch in other performances of the chip, and so on. Therefore, the design of the circuit capable of widening the working voltage range of the power supply has important significance.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to provide a circuit for broadening the input operating voltage range of a mains power supply, enabling the power supply to operate over a wider operating voltage range.
The technical scheme adopted by the utility model is as follows:
the utility model provides a circuit for widening the input working voltage range of a power supply, wherein input sampling is an input voltage detection pin of the power supply, the input sampling voltage is lower than a lower limit voltage Vrefmin or higher than an upper limit voltage Vrefmax, the power supply is in a protection state and has no output, the lower limit voltage Vrefmin and the upper limit voltage Vrefmax are well defined when a power supply control chip is developed, the input sampling circuit comprises a first resistor (R1) and a second resistor (R2), the first resistor (R1) and the second resistor (R2) are connected in series, a power supply input direct current voltage Vint is applied to the first resistor (R1) and the second resistor (R2), and the input sampling voltage is the divided voltage of the second resistor (R2); the input sampling circuit is characterized in that a widened voltage circuit is connected in parallel with the second resistor (R2) of the input sampling circuit, the widened voltage circuit comprises a voltage dividing resistor and a voltage stabilizing element connected in series with the voltage dividing resistor, and the threshold voltage of the voltage stabilizing element is set as follows: between the lower limit voltage Vrefmin and the upper limit voltage Vrefmax.
Further, the voltage regulator is a controllable precision voltage regulator (IC1), and the controllable precision voltage regulator (IC1) is equivalent to a threshold switch.
Further, the voltage dividing resistor is a third resistor (R3).
Further, when the input sampling voltage is greater than the threshold voltage of the controllable precise voltage regulator (IC1), the controllable precise voltage regulator (IC1) is turned on, and the third resistor (R3) is connected in parallel to the second resistor (R2) through the controllable precise voltage regulator (IC 1).
Further, when the input sampling voltage is less than the threshold voltage of the controllable precision voltage regulator (IC1), the controllable precision voltage regulator (IC1) is turned off.
Further, the controllable precision voltage regulator (IC1) is TL 431.
Further, the controllable precision voltage regulator (IC1) is TL 432.
Further, the voltage stabilizing element is a voltage stabilizing diode.
The utility model sets a parallel-connected voltage-broadening circuit on the input sample, the voltage-broadening circuit includes a voltage-dividing resistance and a voltage-stabilizing element, the voltage-stabilizing element is not conducted when the input sample voltage is less than the threshold voltage, and is conducted when the input sample voltage is greater than the threshold voltage, so that the voltage of the input power supply can be increased when the chip works at the upper limit voltage Vrefmax, thereby widening the working voltage range of the power supply. The voltage broadening circuit is safe and reliable, low in cost and convenient to use.
The utility model is widely applied to power supplies of power grids or power supplies with wide input voltage.
Drawings
FIG. 1 is a block diagram of one embodiment of a circuit for broadening the operating voltage range of a power input according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a circuit for broadening the operating voltage range of the power input according to the present invention;
fig. 3 is a schematic diagram of another embodiment of the circuit for widening the operating voltage range of the power input according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example one
Referring to fig. 2, fig. 2 is a schematic structural diagram of a circuit for widening a power input operating voltage range according to an embodiment of the present invention. As shown in fig. 2, the voltage sampling circuit of fig. 2 includes a first resistor R1 and a second resistor R2 connected in series, the second resistor R2 is grounded, and a power input dc voltage Vint is applied across the first resistor R1 and the second resistor R2. The working voltage of the chip, namely the input sampling voltage comes from the voltage division of the second resistor R2, and the input sampling is the input voltage detection pin of the chip. The power supply with the input sampling voltage lower than the lower limit voltage Vrefmin or higher than the upper limit voltage Vrefmax can be in a protection state without output, and the lower limit voltage Vrefmin and the upper limit voltage Vrefmax are well defined during the development of the power control chip.
Wherein a widened voltage circuit as shown in fig. 2 is connected in parallel with the second resistor R2 of the input sampling circuit. The voltage widening circuit comprises a third resistor R3 and a controllable precise voltage regulator IC1 connected with the third resistor R3 in series, and the threshold voltage of the controllable precise voltage regulator IC1 is set as follows: between a lower voltage Vrefmin and said upper voltage Vrefmax.
The controllable precision regulator IC1 behaves as a threshold switch. When the "input sample voltage" is lower than the threshold voltage of the IC1, the IC1 is turned off and the third resistor R3 is disconnected from ground. At this time, the extended voltage circuit does not function. That is, when the chip operates at the lower limit voltage Vrefmin, the circuit is not affected.
When the 'input sampling voltage' is greater than the threshold voltage of the IC1, the IC1 is turned on, and the third resistor R3 is connected in parallel to the second resistor R2 through the IC1, so that the voltage of the second resistor R2, that is, the working voltage of the chip is reduced.
Optionally, the controllable precision voltage regulator IC1 may be of the type TL431 or TL 432.
In other embodiments, the controllable precision voltage regulator may be replaced by another type of voltage regulator element such as a voltage regulator diode shown in fig. 3, and it is ensured that the threshold voltage of the voltage regulator element is set as: between the lower and upper voltage Vrefmin and Vrefmax of the chip. That is, the voltage stabilizing element has the functions of high voltage conduction and low voltage closing as shown in fig. 1.
It should be noted here that if the operating voltage range of the chip is further increased, the resistance of the third resistor R3 only needs to be further reduced.
In this embodiment, a parallel-connected voltage-widening circuit is provided on the input sample, and the voltage-widening circuit includes a voltage-dividing resistor and a voltage-stabilizing element, where the voltage-stabilizing element is not turned on when the input sample voltage is smaller than the threshold voltage thereof, and is turned on when the input sample voltage is larger than the threshold voltage thereof, so that when the chip operates at the upper limit voltage Vrefmax, the input dc voltage Vint of the power supply can be increased, thereby widening the operating voltage range of the power supply. The voltage broadening circuit is safe and reliable, low in cost and convenient to use.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (8)

1. A circuit for widening the input working voltage range of a power supply, wherein input sampling is an input voltage detection pin of the power supply, the input sampling voltage is lower than a lower limit voltage Vrefmin or higher than an upper limit voltage Vrefmax, the power supply is in a protection state and has no output, the lower limit voltage Vrefmin and the upper limit voltage Vrefmax are defined when a power supply control chip is developed, the input sampling circuit comprises a first resistor (R1) and a second resistor (R2), the first resistor (R1) is connected with the second resistor (R2) in series, a power supply input direct current voltage Vint is applied to the first resistor (R1) and the second resistor (R2), the input sampling voltage is the partial voltage of the second resistor (R2), the circuit is characterized in that a widening voltage circuit is connected to the second resistor (R2) of the input sampling circuit in parallel, and comprises a voltage dividing resistor and a voltage stabilizing element connected with the voltage dividing resistor in series, the threshold voltage of the voltage stabilizing element is set to: between said lower and upper limit voltages Vrefmin and Vrefmax.
2. The circuit of claim 1, wherein the voltage regulator element is a controllable precision regulator (IC1), and the controllable precision regulator (IC1) corresponds to a threshold switch.
3. The circuit of claim 2, wherein said voltage divider resistor is a third resistor (R3).
4. The circuit of claim 3, wherein when the input sampling voltage is greater than the threshold voltage of the controllable precision regulator (IC1), the controllable precision regulator (IC1) is turned on, and the third resistor (R3) is connected in parallel with the second resistor (R2) through the controllable precision regulator (IC 1).
5. The circuit of claim 3, wherein the controllable precision regulated voltage source (IC1) is turned off when the input sampled voltage is less than a threshold voltage of the controllable precision regulated voltage source (IC 1).
6. The circuit of claim 2, wherein the controllable precision voltage regulator (IC1) is TL 431.
7. The circuit of claim 2, wherein the controllable precision voltage regulator (IC1) is TL 432.
8. The circuit according to any one of claims 1 to 5, wherein the voltage stabilizing element is a voltage stabilizing diode.
CN202120053780.1U 2021-01-08 2021-01-08 Circuit for widening power supply input working voltage range Active CN215420061U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120053780.1U CN215420061U (en) 2021-01-08 2021-01-08 Circuit for widening power supply input working voltage range

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120053780.1U CN215420061U (en) 2021-01-08 2021-01-08 Circuit for widening power supply input working voltage range

Publications (1)

Publication Number Publication Date
CN215420061U true CN215420061U (en) 2022-01-04

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Application Number Title Priority Date Filing Date
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CN (1) CN215420061U (en)

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