CN210536517U

CN210536517U - Single-input three-output low-power high-temperature isolation direct-current power supply

Info

Publication number: CN210536517U
Application number: CN201921576641.6U
Authority: CN
Inventors: �田�浩; 杨德永
Original assignee: Sanhe Jiatai Petroleum Equipment Co Ltd
Current assignee: Sanhe Jiatai Petroleum Equipment Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-05-15
Anticipated expiration: 2029-09-20

Abstract

The utility model discloses a single-input three-output low-power high-temperature isolation direct-current power supply, which comprises a single-input three-output power supply circuit, wherein the single-input three-output power supply circuit is a ceramic substrate-based thick film circuit, and is encapsulated on a ceramic substrate through high-temperature resistant glue; the single-input three-output power circuit comprises an isolation transformer. The utility model discloses a single input three output miniwatt high temperature isolation DC power supply has small, high temperature resistance's advantage.

Description

Single-input three-output low-power high-temperature isolation direct-current power supply

Technical Field

The utility model relates to a single input three output miniwatt high temperature isolation DC power supply.

Background

The working temperature of the existing switching power supply is generally lower than 125 ℃, and the requirement of a high-temperature working environment cannot be met. Although Ti company has introduced several chip schemes for 210 ℃ power supply, all of them are simple non-isolated single-path output modes, and have poor anti-interference capability, large volume under the condition of requiring multiple voltage multiple-path output, high design complexity, low input/output voltage conversion efficiency and high cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the operational environment temperature that present switching power supply is suitable for and low, the high temperature operational environment of not adapting to, the interference killing feature is poor, and many voltage output circuit designs complicacy and bulky, and input/output's voltage conversion efficiency is low technical problem.

In order to achieve the purpose of the utility model, the utility model provides a single-input three-output low-power high-temperature isolation direct-current power supply, which comprises a single-input three-output power supply circuit, wherein the single-input three-output power supply circuit is a ceramic substrate-based thick film circuit, and is encapsulated on a ceramic substrate through high-temperature resistant glue; the single-input three-output power circuit comprises an isolation transformer.

Further, the input voltage of the single-input three-output power supply circuit is DC +5V- +12V, and the output voltages are DC +12V, -12V and +5V respectively.

Further, the isolation transformer is a manganese-zinc-ferrite-iron powder magnetic core, and the initial magnetic permeability is 56.

Further, the primary coil of the isolation transformer has 24 turns, and the inductance of the isolation transformer is 33 uH; the secondary coil comprises a 24-turn same-direction input coil, a 36-turn same-direction output coil, a 36-turn reverse output coil and a 12-turn same-direction output coil.

Further, the input voltage of the primary coil is DC +5V- +12V, the output voltage of the 24-turn same-direction input coil is 12V and supplies power for the PWM control chip, the output voltage of the 36-turn same-direction output coil is DC +12V, the output voltage of the 36-turn reverse output coil is-12V, and the output voltage of the 12-turn same-direction output coil is + 5V.

Further, the primary coil is connected to an input voltage terminal through a current mode controller and a field effect transistor.

Further, the PWM signal output end of the current mode controller is connected to the grid electrode of the field effect transistor, and the source electrode of the field effect transistor is connected to the primary coil.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a single input three output miniwatt high temperature isolation DC power supply has small, high temperature resistance's advantage. The small size enables the power supply to be applied to the design with strict space requirements, and the high temperature resistance enables the use environment of the power supply to become wider.

Drawings

Fig. 1 is a package diagram of an embodiment of the present invention;

fig. 2 is a schematic diagram of an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model discloses an embodiment of single-input three output miniwatt high temperature isolation DC power supply, as shown in FIG. 1, this DC power supply adopts the encapsulation of chip metallization, the magnetic ring material that the initial magnetic conduction of high curie point is low has been adopted, self-packaging high temperature field effect transistor has been adopted, high accuracy 200 ℃ series high temperature ceramic substrate thick film technology has been used, high temperature encapsulating integration technology, it is 200 ℃ resistant finally to have formed, the overall dimension is 36mm 23mm 15 mm's standard power module, its technical index and pin definition are as follows:

the technical indexes are as follows:

power: 6W;

efficiency: 97 percent;

single input: 5-12V direct current;

outputting: +12V direct current;

-12V dc;

+5V DC.

The pin definition is given in the following table:

pin name	Description of the invention
		Trim	Voltage regulation terminal
GNDin	Input ground
		Vin	Power input
Vo1	Output voltage			1
		GNDout	Output ground
+Vo2	Output voltage			2
		+Vo3	Output voltage 3
-Vo2	Negative output voltage 2

As shown in fig. 2 (including (a) and (b)), the current mode controller employs a Uc3843 chip (i.e., PWM control chip) of fixed frequency, the primary winding of the isolation transformer T1 has 24 turns, and its inductance is 33 uH; the secondary coil comprises a 24-turn same-direction input coil, a 36-turn same-direction output coil, a 36-turn reverse output coil and a 12-turn same-direction output coil. The input voltage of the primary coil is DC +5V- +12V, the output voltage of the 24-turn same-direction input coil is 12V and supplies power for the PWM chip, the output voltage of the 36-turn same-direction output coil is DC +12V, the output voltage of the 36-turn reverse output coil is-12V, and the output voltage of the 12-turn same-direction output coil is + 5V. The primary coil is connected to an input voltage end through a Uc3843 chip and a field effect transistor Q1, a PWM signal output end of the Uc3843 chip is connected to a grid electrode of a field effect transistor Q1, and a source electrode of Q1 is connected to the primary coil of the T1.

Outputting a triangular wave oscillation frequency signal according to the values of R1 and C4, driving PWM pin 6 of Uc3843 chip to output a switching signal to drive field effect transistor Q1, so that Q1 is switched, then current is coupled to a secondary coil through a power supply via transformer T1 primary coil and Q1 and R11 current sampling resistors to ground, the current is coupled to the secondary coil through a magnetic core, 24 turns of chip power supply winding supply power to the chip, at the same time, the voltage obtains a feedback signal through voltage division sampling resistors R2, R3 of a feedback loop (the signal should be 2.5V DC signal, above which the switching signal is turned off, thereby reducing the duty ratio), inputting pin 3 of Uc3843 chip, comparing the waveform with 5V standard reference voltage inside the chip, the comparison value and the voltage value on R11 current sampling resistor (the voltage is triangular wave surge signal, above 1V causes the switching signal to be turned off, reduces the duty ratio) are compared and output, finally, the duty ratio of the output switching signal is adjusted, so that the output voltage is stabilized at a desired output voltage value and the power current required by the load is provided. For example, when the load is heavy and the load current is increased, the current of the secondary winding is increased, and meanwhile, the voltage of the secondary winding is reduced (the voltage reduction of any winding is reflected on the output voltage according to the winding turn ratio), the voltage of the feedback reference level is reduced, when the voltage is lower than 2.5V, the duty ratio of the PWM switch control signal is automatically increased, after the adjustment of several oscillation periods, the feedback voltage is balanced at 2.5V, the adjustment is finished, and the power supply stably works.

The utility model discloses single three output miniwatt high temperature isolation DC power supply of single input is applied to oil drilling and follows closely the drill bit measuring apparatu, because what nearly drill bit measuring apparatu adopted is +18V battery power supply, and available space is narrow and small in the instrument design simultaneously, so uses the utility model discloses single three output miniwatt high temperature isolation DC power supply of single input, firstly fine solved the problem that the space was saved, secondly single three output of single input has solved the problem that needs multiple power work simultaneously.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The single-input three-output low-power high-temperature isolation direct-current power supply is characterized by comprising a single-input three-output power supply circuit, wherein the single-input three-output power supply circuit is a ceramic substrate-based thick film circuit and is packaged on a ceramic substrate through high-temperature-resistant glue; the single-input three-output power circuit comprises an isolation transformer.

2. The single-input three-output small-power high-temperature isolation direct-current power supply as claimed in claim 1, wherein the input voltage of the single-input three-output power supply circuit is DC +5V- +12V, and the output voltages are DC +12V, -12V and +5V respectively.

3. The single input three output low power high temperature isolated dc power supply of claim 1, wherein said isolation transformer is a mn-zn ferrite iron powder core with an initial permeability of 56.

4. The single-input three-output small-power high-temperature isolation direct-current power supply according to claim 3, wherein the primary coil of the isolation transformer has 24 turns, and the inductance of the isolation transformer is 33 uH; the secondary coil comprises a 24-turn same-direction input coil, a 36-turn same-direction output coil, a 36-turn reverse output coil and a 12-turn same-direction output coil.

5. The single-input three-output small-power high-temperature isolated direct-current power supply according to claim 4, wherein the input voltage of the primary coil is DC +5V- +12V, the output voltage of the 36-turn unidirectional output coil is DC +12V, the output voltage of the 36-turn reverse output coil is-12V, and the output voltage of the 12-turn unidirectional output coil is + 5V.

6. The single-input three-output small-power high-temperature isolated DC power supply according to any of claims 4-5, wherein the primary coil is connected to the input voltage terminal through a current mode controller and a field effect transistor.

7. The single-input three-output small-power high-temperature isolated direct current power supply according to claim 6, wherein a PWM signal output terminal of the current mode controller is connected to a gate of the field effect transistor, and a source of the field effect transistor is connected to the primary coil.