Fault detection circuit of direct current fans

A fault detection circuit, DC fan technology, applied in non-varactor pump, pump control, machine/engine and other directions, can solve the problems of high power density of charging pile power module, DC fan failure, affecting normal operation, etc. The cost of components is low, the fault detection is convenient, and the effect of avoiding malfunction

Active Publication Date: 2016-12-21
XIAN TGOOD INTELLIGENT CHARGING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The power module of the charging pile has high power density and small size, so the cooling of the DC fan is essential. However, the DC fan will also fail when it is

Method used

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  • Fault detection circuit of direct current fans
  • Fault detection circuit of direct current fans
  • Fault detection circuit of direct current fans

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0027] Example 1

[0028] Such as figure 1 As shown, the present invention includes a signal conversion circuit, an isolation circuit, and an alarm circuit for detecting fan FAN1; wherein, the signal conversion circuit includes a relay RLY1, the pin 3 of the relay RLY1 is connected with a fault signal FAN_FAIL, and the pin 6 of the relay RLY1 is connected with Fault signal ground GND1. One end of the wire package of the relay RLY1 is connected to the power supply VCC, and the other end is connected to the collector of the transistor Q2. The emitter of the transistor Q2 is grounded and its base is connected to the isolation circuit through a resistor R5. The isolation circuit includes an optocoupler U1 And the transistor Q1, wherein the secondary pin 4 of the optocoupler U1 is connected to the base of the transistor Q2 and the power supply VCC respectively. A resistor R4 is provided between the secondary pin 4 of the optocoupler U1 and the power supply VCC, and the secondary side t...

Example Embodiment

[0035] Example 2:

[0036] Reference figure 2 In this embodiment, on the basis of embodiment 1, an isolation circuit and an alarm circuit for detecting fan FAN3 are added. The newly added isolation circuit includes optocoupler U2 and transistor Q3. The secondary pin 4 of optocoupler U2 is connected to U1. The secondary side pin 4, the secondary side pin 3 is grounded, the primary side pin 1 is connected to the power supply VCC through the resistor R9, the primary side pin 2 is connected to the collector of the transistor Q3, and the emitter of the transistor Q3 is connected to the fan ground FAN3 -Connection, the base is connected to the alarm circuit through a resistor R10, the alarm circuit includes a light emitting diode D3 and a fan alarm signal FAN3_BAD, wherein the cathode of the light emitting diode D3 is connected to the base of the transistor Q3, and the anode of the light emitting diode D3 is respectively connected to the power supply VCC is connected to the fan alarm ...

Example Embodiment

[0038] Example 3:

[0039] Reference image 3 In this embodiment, on the basis of embodiment 2, two new alarm circuits are added, which are the second alarm circuit used to detect fan FAN2 and the fourth alarm circuit used to detect fan FAN4. Among them, fan FAN2 and fan FAN1 Common fan ground FAN1-, fan FAN3 and fan FAN4 share fan ground FAN3-, that is, several fans connected to the same isolation circuit for fault detection use the common fan ground setting;

[0040] The second alarm circuit includes a light-emitting diode D2 and a fan alarm signal FAN2_BAD. The fourth alarm circuit includes a light-emitting diode D4 and a fan alarm signal FAN4_BAD. The cathode of the light-emitting diode D2 is connected to the base of the transistor Q1 through a resistor R2, and the anode is respectively connected to the power supply VCC Connected to the fan alarm signal FAN2_BAD, a current limiting resistor R6 is set between the light emitting diode D2 and the power supply VCC, that is, the fan...

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Abstract

The invention discloses a fault detection circuit of direct current fans. The fault detection circuit comprises a relay. A pin 3 of the relay is connected with a fault signal, and a pin 6 of the relay is connected with a fault signal ground. One end of a coil of the relay is connected with a power source, and the other end of the coil of the relay is connected with a collector of a triode Q2. An emitter of the triode Q2 is in ground connection, and a base of the triode Q2 is connected with isolation circuits. One isolation circuit comprises an optocoupler U1 and a triode Q1. A secondary pin 4 of the optocoupler U1 is connected with the base of the triode Q2 and the power source, a secondary pin 3 of the optocoupler U1 is in ground connection, a primary pin 1 of the optocoupler U1 is connected with the power source, and a primary pin 2 of the optocoupler U1 is connected with a collector of the triode Q1. An emitter of the triode Q1 is connected with a fan ground, and a base of the triode Q1 is connected with warning circuits. One warning circuit comprises a light emitting diode D1 and a fan warning signal. The characteristics of one-way conduction of light emitting diodes and light emitting achieved after conduction are utilized, the functions of monitoring the states of the fans in real time and outputting an alarm signal are achieved, and the circuit is simple and reliable.

Description

technical field [0001] The invention relates to the technical field of fan fault detection, in particular to a DC fan fault detection circuit. Background technique [0002] Heat dissipation is an important issue for power electronic products. Power electronic devices generate a lot of heat during operation. If the heat is not dissipated in time and run for a long time, the temperature of the device will rise. Long-term work will affect the life of the device or even damage the device. Among many heat dissipation methods, forced air cooling is one of the most commonly used heat dissipation methods, and DC fan cooling plays a pivotal role in solving heat dissipation problems. [0003] The power module of the charging pile has high power density and small size, so the cooling of the DC fan is essential. However, the DC fan will also fail when it is working. If the faulty fan is not found in time for repair and replacement, it will affect the power module of the charging pile an...

Claims

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Application Information

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IPC IPC(8): F04D27/00
CPCF04D27/001F04D27/008
Inventor 袁庆民茹永刚张军涛沈得贵李建华
Owner XIAN TGOOD INTELLIGENT CHARGING TECH CO LTD
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