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Multi-voltage conversion device for intrinsically safe direct current power supply

An intrinsically safe DC power supply technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, electrical components, etc., can solve the problems of power output power loss, application restrictions, large starting current, etc., to achieve High precision of voltage regulation, overcoming the curve of voltage instability, and the effect of eliminating product differences

Inactive Publication Date: 2013-09-18
CHANGSHU HENGZHENG APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-voltage Zener diodes have the following problems: There may be a 10% error in the stable voltage of the same type of Zener diode; under different operating currents, the stable voltage of the Zener diode varies greatly, especially when the operating current is small, The voltage fluctuates greatly. For Zener diodes below 3V, there is a voltage change of about 10%. At the same time, it is difficult to obtain low-voltage Zener diodes with large currents.
If a linear regulator is used for voltage regulation, a large part of the output power of the power supply will be lost in the linear regulator, resulting in a reduction in output power
And if DC-DC components are used to adjust the voltage, although many existing DC-DC modules have soft-start circuits to reduce the starting current, the starting current is still too large. For intrinsically safe power supplies, as long as The load it connects is greater than the maximum load it allows, and the power supply will be cut off. Therefore, the application of DC-DC modules in intrinsically safe power supply occasions is greatly restricted.

Method used

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  • Multi-voltage conversion device for intrinsically safe direct current power supply
  • Multi-voltage conversion device for intrinsically safe direct current power supply
  • Multi-voltage conversion device for intrinsically safe direct current power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one: see figure 1 As shown, an intrinsically safe DC power supply multi-voltage conversion device is mainly composed of a constant current source and four voltage stabilizing modules connected in series. device isolation; see attached figure 2As shown, it is a schematic diagram of the circuit structure of one of the voltage stabilizing modules, which adopts a triode amplifier circuit structure with a common emitter. The triode is a composite tube composed of two triode single tubes. The pole tube adopts PNP tube, the collector of the first triode is connected to the base of the second triode, and the whole composite tube is NPN type, wherein, the base of the first triode is the base of the composite tube, and the first The emitter of the triode is connected with the collector of the second triode to form the emitter of the compound tube, and the emitter of the second triode forms the collector of the compound tube.

[0032] There is a regulator tube betwee...

Embodiment 2

[0048] Embodiment two: see Figure 4 Shown is a schematic diagram of the circuit structure of a voltage stabilizing module. The voltage regulator module is powered by a constant current source, and the voltage sampling is performed by the voltage regulator tube D w1 and resistor R 2 , W 2 The voltage-controlled current component consists of an operational amplifier LM324, a feedback resistor R f , a voltage reference and a triode T, where the voltage reference is composed of a resistor R 1 , W 1 and Zener tube D w2 composition.

[0049] The working principle of the voltage sampling circuit: the Zener tube has a corresponding volt-ampere characteristic when it is working normally, and this characteristic is regarded as an equivalent resistance RD, that is

[0050] RD= ………………………………(1)

[0051] Taking C2V7 as an example, when the voltage varies from 2.5V to 2.9V, the corresponding current varies from about 1 to 9mA. According to formula (1), it can be known that whe...

Embodiment 3

[0066] Embodiment three: see Figure 5 Shown is a schematic diagram of the circuit structure of a voltage stabilizing module. The FET voltage regulator module is powered by a constant current source, and the voltage sampling part is controlled by a resistor R 1 and W 1 Composition, the voltage-controlled current component is realized by a field effect transistor, and it can also be composed of two or more field effect transistors to form a multi-stage amplification and current adjustment structure. Field effect transistors can be either N-channel or P-channel. In this example, an enhanced N-channel FET is used to realize the amplification and current adjustment functions. The voltage sampling of this voltage stabilization module is taken from R 1 and W 1 The sampling point a of the divided voltage, through the resistance R 2 The power supply output terminal is formed between the gate input and the drain and source

[0067] Working principle of the module: According to t...

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Abstract

The invention discloses a multi-voltage conversion device for a direct current power supply. The device is powered by the direct current power supply, and is characterized by mainly comprising a current limiting device and at least two voltage stabilizing modules which are connected in series, wherein each voltage stabilizing module has a triode amplifying circuit structure consisting of a voltage stabilizing diode and a common emitter; the triode is selected from a single transistor or a compound transistor; a voltage stabilizing tube is arranged between the collector and the base of the triode; a biasing resistor with adjustable resistance is arranged between the base and the emitter; a power output end is formed between the collector and the emitter; and the power output end of each voltage stabilizing module has a serial stacked structure. The device can form the voltage stabilizing circuit with various voltages and currents, has a simple circuit structure, is convenient to realize and can eliminate the influence caused by product difference of the voltage stabilizing diode and guarantee the stability of output voltage.

Description

technical field [0001] The present invention relates to a power supply device, in particular to a device for converting an intrinsically safe DC power supply into a plurality of lower voltage power supplies, especially an intrinsically safe DC power supply that can provide a larger current at a voltage of 5V or lower Type power conversion device. Background technique [0002] Intrinsically safe circuit refers to: under the conditions specified in the national standard GB3836.4-2000 "Electrical Equipment for Explosive Gas Atmospheres Part 4: Intrinsically Safe Type "i"" (including normal operation and specified fault conditions), any Electric sparks or any thermal effects cannot ignite circuits in specified explosive gas atmospheres; intrinsically safe equipment refers to electrical equipment in which all circuits inside the equipment are intrinsically safe circuits. The characteristic of this kind of equipment is that it does not rely on the solid shell, but relies on the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00H02M3/156
Inventor 黄晓颖邵鹏武强张潜
Owner CHANGSHU HENGZHENG APPLIANCE