CN211127608U

CN211127608U - Linear voltage stabilizing circuit supporting conversion from isolated or non-isolated high-voltage alternating current to direct current

Info

Publication number: CN211127608U
Application number: CN201922329229.0U
Authority: CN
Inventors: 门洪达
Original assignee: Suzhou Jianwei Industrial Technology Co ltd
Current assignee: Suzhou Jianwei Industrial Technology Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-07-28
Anticipated expiration: 2029-12-23

Abstract

The utility model discloses a support isolation or non-isolation high pressure to exchange linear voltage stabilizing circuit of direct current, the isolation application circuit that sets up including the non-isolation application circuit who sets up alone or non-isolation application circuit connection, the non-isolation application circuit is including being used for the rectifier unit that is the steamed bun wave form with sine wave alternating voltage rectification, the output voltage setting unit that is used for detecting the voltage of steamed bun wave form and intercepting low-voltage portion distributes to the low-voltage switch unit of first output voltage circuit, L DO voltage stabilizing unit of connecting the low-voltage switch unit, L DO voltage stabilizing unit is connected with adjustable fixed voltage output value, a L DO voltage stabilizing unit for the linear step-down of low-voltage difference carries the stable direct current voltage to second output voltage circuit, the utility model discloses a better output performance, and its total cost compare in traditional resistance-capacitance step-down will have more the advantage.

Description

Linear voltage stabilizing circuit supporting conversion from isolated or non-isolated high-voltage alternating current to direct current

Technical Field

The utility model belongs to the technical field of voltage circuit, especially, relate to a support isolation or non-isolation high pressure and exchange direct current linear voltage stabilizing circuit.

Background

In traditional small household electrical appliances (such as a small night lamp, an electric fan, a hairdressing product, an electric shaver and the like), a power supply scheme of a plurality of products mostly adopts a resistance-capacitance voltage reduction scheme. The resistance-capacitance voltage reduction has the advantages of low cost, but has the disadvantages that: 1) the power consumption and the resistance-capacitance voltage reduction adopt the impedance current limiting of a capacitor under power frequency, the output voltage is obtained through voltage stabilizing tube clamping, and when a load does not work, the voltage stabilizing tube always works in a voltage clamping state to consume energy. 2) Stability: the stability of resistance-capacitance voltage reduction work is established on the basis of input voltage stability, and when distortion stray waves appear in the input voltage, the distortion stray waves can be coupled to a load end by capacitance, so that current mutation is caused, and devices and loads are damaged. When the input voltage is reduced, the current of the circuit is reduced, which may cause system power failure, and when the input voltage is increased, the current of the circuit is increased, which may exceed the bearing range of the clamping voltage regulator tube, resulting in permanent damage. 3) The service life, the attenuation after the capacitor is used for a long time, and the supply capacity of the circuit is reduced, so that the product cannot be used because the power supply is abnormal. 4) The resistance-capacitance voltage reduction circuit cannot be isolated and cannot be used for products with requirements on electrical safety.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem, and provide and support isolation or non-isolation high pressure and exchange direct current linear voltage regulator circuit to realize better output performance, and its total cost will have more advantages than in traditional resistance-capacitance step-down. In order to achieve the above purpose, the utility model discloses technical scheme as follows:

the isolating application circuit comprises a non-isolating application circuit which is arranged independently or is connected with the non-isolating application circuit, the non-isolating application circuit comprises a rectifying unit which is used for rectifying sine wave alternating voltage into steamed bread waveforms, a low-voltage switch unit which is used for detecting the voltage of the steamed bread waveforms and intercepting and sending the low-voltage part to a first output voltage circuit, an L DO voltage stabilizing unit which is connected with the low-voltage switch unit, an L DO voltage stabilizing unit which is connected with an output voltage setting unit which can adjust a fixed voltage output value, and an L DO voltage stabilizing unit which is used for low-voltage difference linear voltage reduction and sending stable direct current to a second output voltage circuit, the isolating application circuit comprises a L DO voltage stabilizing unit which is connected with a direct current inversion unit in parallel, an isolating transformer and a rectifying and filtering unit which are sequentially connected with the direct current inversion unit, and the rectifying and filtering unit is connected with a third output voltage circuit.

Specifically, the low-voltage switch unit is connected in parallel with a starting circuit.

Specifically, the first output voltage line and the second output voltage line are both provided with filter capacitors.

Specifically, when the output voltage setting unit is connected to a high level, a fixed value of 5V is output; when the output voltage setting unit is suspended, outputting a fixed value of 3.3V; when the output voltage setting unit is connected with the low level, a fixed value of 2.7V is output.

Specifically, a compensation feedback unit is arranged between the L DO voltage stabilizing unit and the DC inversion unit

Compared with the prior art, the utility model discloses support isolation or non-isolation high pressure to exchange the beneficial effect of changeing direct current linear voltage stabilizing circuit and mainly reflect:

the AC input is directly converted into three voltages of 3.3V, 2.7V or 5V; the isolation is supported, and the isolation can be realized by connecting a transformer and is used for products which need to be isolated for power supply in conventional authentication; the utility model discloses an isolation technique is different from conventional switching power supply, and the transformer high pressure of conventional switching power supply inputs low voltage output, and general transformer need do the energy storage, and the magnetic core utilization ratio of transformer is less than 50%; the utility model discloses an isolation technique is that low pressure input low voltage output and transformer need not do the energy storage, and the magnetic core utilization ratio of transformer is greater than 50%, and the cost of transformer is lower, and the total cost of circuit is also lower than the power of conventional switch, obtains better output performance, and its total cost will be less than the resistance-capacitance step-down.

Drawings

FIG. 1 is a schematic diagram of a non-isolated application circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the circuit connections for isolation applications in this embodiment;

FIG. 3 is a schematic diagram of a switching waveform of the rectifying unit in the present embodiment;

FIG. 4 is a schematic diagram of a switching waveform of the low-pass switch unit in the present embodiment;

fig. 5 is a schematic diagram of a waveform of the first output voltage line V1 after being filtered by the capacitor in the present embodiment;

fig. 6 is a schematic diagram illustrating setting of an adjustable fixed value voltage in the output voltage setting unit according to the present embodiment;

FIG. 7 shows one of the circuit integration methods in this embodiment:

FIG. 8 shows a second circuit integration method in the present embodiment;

FIG. 9 shows a third circuit integration method in the present embodiment;

FIG. 10 shows a fourth embodiment of the circuit integration method of the present embodiment;

the figures in the drawings represent:

the device comprises a rectification unit 1, a low-voltage switch unit 2, an output voltage setting unit 3, a voltage stabilizing unit 4L DO, a compensation feedback unit 5, a direct current inversion unit 6, a filter capacitor 7, an isolation transformer 8 and a rectification filter unit 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments.

Example 1:

referring to fig. 1-6, the present embodiment is a linear voltage regulator circuit supporting an isolated or non-isolated high-voltage ac-to-dc conversion, and includes a rectifying unit 1 for rectifying a sine wave ac voltage into a steamed bun waveform, a low-voltage switching unit 2 for detecting a voltage of the steamed bun waveform and intercepting the low-voltage portion and sending the voltage to a first output voltage line V1, a L DO voltage regulating unit 4 connected to the low-voltage switching unit 2, an output voltage setting unit 3 connected to the L DO voltage regulating unit 4 and capable of adjusting a fixed voltage output value, and a L DO voltage regulating unit 4 for low-voltage drop linear voltage regulation for sending a regulated dc voltage to a second output voltage line V2.

The low-voltage switch unit 2 is connected with a starting circuit in parallel.

The second output voltage line V2 may be powered by products that do not have isolation requirements.

The first output voltage line V1 and the second output voltage line V2 are both provided with filter capacitors.

When the output voltage setting unit 3 is connected with a high level, a fixed value of 5V is output; when the output voltage setting unit 3 is suspended, a fixed value of 3.3V is output; when the output voltage setting unit 3 is connected to a low level, a fixed value of 2.7V is output.

The circuit is directly used as non-isolated application, and has the advantage of low cost.

Example 2:

referring to fig. 2 to 6, based on embodiment 1, a direct current inverter unit 6 is connected in parallel to the L DO voltage regulator unit 4, the direct current inverter unit 6 is connected to an isolation transformer 8 and a rectification filter unit 9 in sequence, the direct current inverter unit 6, the isolation transformer 8 and the rectification filter unit 9 constitute a complete isolation application circuit, the direct current inverter unit 6 converts the voltage of the second output voltage line V2 into a high-frequency square wave signal to drive the isolation transformer 8, the high-frequency square wave signal is transmitted to the third output voltage line V3 through the rectification filter unit 9, and the third output voltage line V3 supplies power to a load.

L a compensation feedback unit 5 is provided between the lines of the DO voltage stabilization unit 4 and the dc inversion unit 6, and the compensation feedback unit 5 adjusts the voltage in the L DO voltage stabilization unit by detecting the voltage and current on the dc inversion unit, and performs compensation adjustment on the voltage of the third output voltage line V3.

Example 3:

referring to fig. 7, based on embodiment 2, the rectifying unit 1, the low-voltage switching unit 2, the output voltage setting unit 3, the L DO regulator unit 4, the compensation feedback unit 5, and the dc inverter unit 6 are connected to the circuit application as a whole.

Example 4:

referring to fig. 8, based on embodiment 1, the rectifying unit 1, the low-voltage switching unit 2, and the output voltage setting unit 3, L DO regulator unit 4 are connected to a circuit application as a whole.

Example 5:

referring to fig. 9, based on embodiment 2, the low-voltage switching unit 2, the output voltage setting unit 3, L DO regulator unit 4, the compensation feedback unit 5, and the dc inverter unit 6 are connected to the circuit application as a whole in an integrated manner.

Example 6:

referring to fig. 10, based on embodiment 1, the low-voltage switching unit 2 and the output voltage setting unit 3, L DO regulator unit 4 are connected to a circuit application as a whole in an integrated manner.

When the embodiment is applied, the alternating current input is directly converted into three voltages of 3.3V, 2.7V or 5V; the isolation is supported, and the isolation can be realized by connecting a transformer and is used for products which need to be isolated for power supply in conventional authentication; the utility model discloses an isolation technique is different from conventional switching power supply, and the transformer high pressure of conventional switching power supply inputs low voltage output, and general transformer need do the energy storage, and the magnetic core utilization ratio of transformer is less than 50%; the utility model discloses an isolation technique is low pressure input low voltage output and the transformer need not do the energy storage, and the magnetic core utilization ratio of transformer is greater than 50%, and the cost of transformer is lower, and the total cost of circuit is also lower than the power of conventional switch, obtains better output performance, and its total cost compares and will have more advantages in traditional resistance-capacitance step-down.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. The linear voltage stabilizing circuit supporting the conversion of isolated or non-isolated high-voltage alternating current into direct current is characterized by comprising a non-isolated application circuit which is independently arranged or an isolated application circuit which is connected with the non-isolated application circuit, wherein the non-isolated application circuit comprises a rectifying unit for rectifying sine wave alternating voltage into steamed bun waveforms, a low-voltage switch unit for detecting the voltage of the steamed bun waveforms and intercepting the low-voltage part to be sent to a first output voltage circuit, an L DO voltage stabilizing unit connected with the low-voltage switch unit, and an L DO voltage stabilizing unit which is connected with an output voltage setting unit capable of adjusting a fixed voltage output value, and an L DO voltage stabilizing unit for low-voltage difference linear voltage reduction is used for sending the stabilized direct current to a second output voltage circuit, the isolated application circuit comprises a direct current inversion unit which is connected in parallel with a L DO voltage stabilizing unit, an isolation transformer and a rectification filtering unit which are sequentially connected with the direct current inversion unit, and the.

2. The linear voltage regulator circuit supporting isolation or non-isolation from high voltage alternating current to direct current of claim 1, wherein: and the low-voltage switch unit is connected with a starting circuit in parallel.

3. The linear voltage regulator circuit supporting isolation or non-isolation from high voltage alternating current to direct current of claim 1, wherein: and the first output voltage circuit and the second output voltage circuit are both provided with filter capacitors.

4. The linear voltage regulator circuit supporting isolation or non-isolation from high voltage alternating current to direct current of claim 1, wherein: when the output voltage setting unit is connected with a high level, a fixed value of 5V is output; when the output voltage setting unit is suspended, outputting a fixed value of 3.3V; when the output voltage setting unit is connected with the low level, a fixed value of 2.7V is output.

5. The linear voltage regulator circuit supporting isolation or non-isolation from high voltage AC to DC according to claim 1, wherein a compensation feedback unit is disposed between the lines of the L DO voltage regulator unit and the DC inverter unit.