CN217332573U - High-temperature test reliability protection circuit - Google Patents
High-temperature test reliability protection circuit Download PDFInfo
- Publication number
- CN217332573U CN217332573U CN202220916324.XU CN202220916324U CN217332573U CN 217332573 U CN217332573 U CN 217332573U CN 202220916324 U CN202220916324 U CN 202220916324U CN 217332573 U CN217332573 U CN 217332573U
- Authority
- CN
- China
- Prior art keywords
- resistor
- interface
- power supply
- module
- alarm module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a high temperature test reliability protection circuit belongs to control by temperature change circuit technical field, include: the signal input ends of the two overvoltage protection modules are respectively connected with the two groups of power input interfaces, the redundant protection module is connected with the two overvoltage protection modules, and the overcurrent detection module is connected with the redundant protection module and the alarm module; the temperature detection alarm module is connected with the alarm module; the voltage conversion module is connected with the over-redundancy protection module and supplies power to the alarm module, the over-current detection module and the temperature detection alarm module. The utility model provides a control end scram terminal of circuit and product is linked together, helps solving under the too high or bad circumstances of product heat dissipation, in time reports to the police and controls the product and shut down, reminds the staff in time to investigate the reason, plays the guard action to the product, helps solving high and low temperature box temperature anomaly or the too high guard action of product temperature, prevents that the product secondary from destroying and arousing the incident.
Description
Technical Field
The utility model belongs to the technical field of the control by temperature change circuit, concretely relates to high temperature test reliability protection circuit.
Background
The high-low temperature test is used for simulating the temperature change rule in the atmospheric environment and mainly aims at the adaptability test of electricians and electronic products, components and other materials of the electricians and the electronic products during transportation and use in the high-temperature and low-temperature comprehensive environment. The temperature and humidity testing device is used for links of product design, improvement, identification, inspection and the like, and generally has the characteristics of temperature change, humidity requirement, long-time work and the like, and the 24-hour/168-hour test causes damage to products.
Under the condition that the test temperature is too high or the product is poor in heat dissipation, the secondary damage of the product can be caused to cause safety accidents, and when the problems occur, the circuit of the existing test product cannot give a prompt in time.
Based on this, the utility model provides a high temperature test reliability protection circuit.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies in the prior art, the utility model provides a high temperature test reliability protection circuit.
In order to achieve the above object, the present invention provides the following technical solutions:
a high temperature test reliability protection circuit, comprising:
the signal input ends of the two overvoltage protection modules are respectively connected with the two groups of power supply input interfaces and used for detecting the voltage value of an input power supply; when the power supply fails, interrupting the power supply;
the signal input end of the redundancy protection module is connected with the signal output ends of the two overvoltage protection modules and is used for automatically switching the power supplies when one group of power supplies fails;
the alarm module comprises an isolation optocoupler chip U5 and a light emitting diode LED1 which are sequentially connected, and the secondary side of the isolation optocoupler chip U5 is connected with an emergency stop terminal at the control end of the test product;
the signal input end of the overcurrent detection module is connected with the redundancy protection module, and the signal output end of the overcurrent detection module is connected with the cathode of an isolation optocoupler chip U5 of the alarm module; when the detection current exceeds a threshold value, outputting a low level to a cathode of an isolation optocoupler chip U5;
the signal output end of the temperature detection alarm module is connected with the cathode of an isolation optocoupler chip U5 of the alarm module; when the detected temperature exceeds the overturning threshold value, outputting a low level to the cathode of the isolation optocoupler chip U5;
the signal input end of the voltage conversion module is connected with the signal output end of the over-redundancy protection module, and the signal output end of the voltage conversion module is connected with the signal input end of the alarm module and used for supplying power to the alarm module, the over-current detection module and the temperature detection alarm module;
when the cathode of an isolation optocoupler chip U5 of the alarm module receives a low level, the light emitting diode LED1 flashes for alarm to remind abnormal temperature; and meanwhile, after the emergency stop terminal of the test product receives a signal of the conduction of the secondary side of the isolation optocoupler chip U5, the emergency stop terminal of the test product controls the product to stop.
Preferably, one group of the overvoltage protection modules comprises a voltage comparator U4, wherein a non-inverting input terminal and an inverting input terminal of the voltage comparator U4 are respectively connected with anodes of one group of the power input interfaces through a resistor R15 and a resistor R14, and are respectively connected with the ground through a resistor R21 and a zener diode Z2; the positive power supply end of the voltage comparator U4 is connected with the positive electrode of the power supply input interface, the negative power supply end is grounded, the output end of the voltage comparator U4 is connected with the contact end of the control switch Q2 through a resistor R17, and meanwhile, the resistor R17 is connected with the positive electrode of the power supply input interface after being connected with a Zener diode Z1 in series; the signal input end of the control switch Q2 is connected with the positive electrode of the power input interface, and the output end of the control switch Q2 is connected with the input end of the redundancy protection module;
the other group of overvoltage protection modules comprises a voltage comparator U6, wherein a positive phase input end and a negative phase input end of the voltage comparator U6 are respectively connected with the positive electrode of the other group of power supply input interfaces through a resistor R27 and a resistor R26, and are respectively grounded through a resistor R32 and a Zener diode Z4; the positive power supply end of the voltage comparator U4 is connected with the positive electrode of the power supply input interface, the negative power supply end is grounded, the output end of the voltage comparator U4 is connected with the contact end of the control switch Q4 through a resistor R28, and meanwhile, the resistor R28 is connected with the positive electrode of the power supply input interface after being connected with a Zener diode Z3 in series; and the signal input end of the control switch Q4 is connected with the positive electrode of the power supply input interface, and the output end of the control switch Q4 is connected with the input end of the redundancy protection module.
Preferably, the redundancy protection module comprises a multi-source multiplexer U3, an IN1 interface of the multi-source multiplexer U3 is connected with an output end of the control switch Q2, an IN2 interface is connected with an output end of the control switch Q4, and an OUT interface is connected with the voltage conversion module and the overcurrent protection module.
Preferably, the OV1 interface of the multi-source multiplexer U3 is connected with the output end of the control switch Q2 through a resistor R11, and the resistor R11 is grounded through a resistor R18;
the PRI interface of the multi-source multiplexer U3 is connected with the output end of the control switch Q2 through a resistor R10, the ST interface thereof is connected with the output end of the control switch Q2 through a resistor R13 and a resistor R10, and the resistor R10 is grounded through a resistor R12;
the IN2 interface of the multi-source multiplexer U3 is grounded through a resistor R23 and a resistor R25, the OV2 interface thereof is grounded through a resistor R25, the ILM interface thereof is grounded through a resistor 24, and the SS interface thereof is grounded through a capacitor C6.
Preferably, the overcurrent detection module comprises a current detection amplifier U1, and a sampling resistor R3 is connected in parallel between the INP interface and the INN interface of the current detection amplifier U1; an INP interface of the current detection amplifier U1 is connected with an OUT interface of the multi-source multiplexer U3, and an INN interface is connected with a power supply end of an isolation optocoupler chip U5 of the alarm module; an ALERT interface of the current detection amplifier U1 is connected with a cathode of an isolation optocoupler chip U5 of the alarm module.
Preferably, the VOUT interface and the CMPIN interface of the current detection amplifier U1 are connected in series through a resistor R4, and the CMPREF interface thereof is respectively connected to a 5V power supply through a resistor R7 and to ground through a resistor R9; the ALERT interface is connected with a 5V power supply through a resistor R2, and is grounded after being connected with a light emitting diode D1 and a resistor R1 in series through a Mosfet tube Q1; the VS interface is connected to ground through a capacitor C1.
Preferably, the voltage conversion module includes a buck converter U2, a Vin interface of the buck converter U2 is connected to an OUT interface of the multi-source multiplexer U3, and an Vout interface is connected to an input end of an isolation optocoupler chip U5 of the alarm module, so as to supply power to the alarm module and the temperature detection alarm module.
Preferably, a capacitor C2 and a capacitor C3 are connected in parallel to the connection circuit of the buck converter U2 and the multi-source multiplexer U3, and the SS/TR interface of the buck converter U2 is connected with a capacitor C2 and a capacitor C3 through a capacitor C5, and is grounded through a capacitor C5; the PG interface and the FB interface of the buck converter U2 are connected in series and then connected in parallel with a resistor R5 and a resistor R6 between the Vout interface, the Vout interface is grounded through a capacitor C4, one end of the resistor R6 is connected with a 5V power supply, and the other end of the resistor R6 is grounded through an R8.
Preferably, the temperature detection alarm module comprises a voltage comparator U7, wherein the non-inverting input end of the voltage comparator U7 is connected with a 5V power supply through resistors R31 and R29, and is also connected with a thermistor NTC1 through a resistor R31; the inverting input end of the capacitor is connected with a 5V power supply through a resistor R35, and is grounded through a resistor R36 and a capacitor C10 which are connected in parallel; a capacitor C8 is connected in parallel between the thermistor NTC1 and the resistor R31, and a capacitor C7 is connected in parallel between the non-inverting input end of the voltage comparator U7 and the resistor R31;
the positive power supply of the voltage comparator U7 is connected with a 5V power supply, the negative power supply is grounded, and the output end of the voltage comparator U7 is connected with the cathode of an isolation optocoupler chip U5 of the alarm module through a resistor R34;
a resistor R30 is connected in series between the non-inverting input end and the output end of the voltage comparator U7, one end of the resistor R30 is positioned between the output end of the voltage comparator U7 and the resistor R34, a resistor R33 is also connected in parallel between the resistor R30 and the resistor R34, and a capacitor C9 is also connected in series behind the resistor R34.
Preferably, the secondary side of the isolation optocoupler chip U5 is connected with a light emitting diode LED1 and a resistor R16 in sequence, and then is connected with an INN interface of the current detection amplifier U1, and the cathode is connected with a resistor R34 of the temperature detection alarm module and an ALERT interface of the current detection chip U1 through a resistor R20 and a resistor R19, respectively;
the anode of the isolation optocoupler chip U5 is connected with the Vout interface of the buck converter U2, and the output end J2 is grounded through a resistor R22.
The utility model provides a high temperature test reliability protection circuit has following beneficial effect:
the two overvoltage protection modules provide two paths of power supply output, the power supply incoming line is protected preferentially, the subsequent chip is protected, and the redundant protection module plays a more reliable role in the subsequent circuit operation; the signals of the temperature detection alarm module and the overcurrent detection module with low power consumption are collected to the optical coupling cathode, so that a follow-up circuit is saved, the optical coupling cathode receives a low-level signal when overcurrent or overheating occurs, the light emitting diode LED1 flashes and gives an alarm in time to remind a worker to troubleshoot fault reasons in time, and meanwhile, the whole circuit is connected with the control emergency stop terminal of the product, so that the problem of overhigh temperature or poor heat dissipation of the product is solved, the alarm is given in time, and the product is controlled to stop (two states of operation and stop are provided after the product is electrified).
The utility model discloses do not need software control, application pure hardware realizes protect function, and the reliability is high, does not receive communication interference, crash, host computer outage influence, helps promoting the security of electronic product, improves the research and development progress of product and avoids frequently damaging experimental model machine.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the invention, and it will be clear to a person skilled in the art that other drawings can be obtained on the basis of these drawings without inventive effort.
Fig. 1 is a schematic diagram of a high temperature test reliability protection circuit provided by the present invention;
fig. 2 is a circuit diagram of a high temperature test reliability protection circuit provided by the present invention;
FIG. 3 is a circuit diagram of a temperature detection alarm module;
FIG. 4 is a circuit diagram of an overvoltage protection module;
FIG. 5 is a circuit diagram of a voltage conversion module;
FIG. 6 is a circuit diagram of an over-current detection module;
FIG. 7 is a circuit diagram of a redundancy protection module;
FIG. 8 is a circuit diagram of an alarm module;
fig. 9 is a circuit diagram of the power input interface.
Detailed Description
In order to make the technical solution of the present invention better understood and practical for those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The utility model aims at providing a perfect excessive pressure, overflow, excess temperature, redundant protection, mutual noninterference between the protection, the detection that has stopped arousing because of the power failure is interrupted, the temperature rise that can be reliably timely detection is tested the product changes, safe and reliable's the power supply who cuts off the product, in time, the protection product avoids the product to suffer the damage, and do benefit to the reason of investigation of reforming, fuse in the power supply loop of product, fine protection the product, avoid the most problems in later stage in advance.
Based on this, the present embodiment provides a high temperature test reliability protection circuit, as shown in fig. 1 and fig. 2, the device includes a redundant protection module, an alarm module, an overcurrent detection module, a temperature detection alarm module, a voltage conversion module, and two overvoltage protection modules.
The signal input ends of the two overvoltage protection modules are respectively connected with the two groups of power supply input interfaces and used for detecting the voltage value of an input power supply; when the power supply fails, the power supply is interrupted. In this embodiment, when the power supply is too high (exceeding 18V) due to an external reason, the overvoltage protection module can interrupt the power supply in time, so as to achieve a protection effect and effectively suppress transient oscillation of the operation overvoltage.
And the signal input end of the redundancy protection module is connected with the signal output ends of the two overvoltage protection modules and is used for automatically switching the power supplies when one group of power supplies fails.
The failure described in this embodiment is, for example, a voltage exceeding a threshold, or a power failure of one of the overvoltage protection modules, which is equivalent to that a product is exposed in a manner of damaging the product when operating without protection, and the manner of the redundant power supply is more secure and reliable.
The alarm module comprises an isolation optocoupler chip U5 and a light emitting diode LED1 which are connected in sequence, and the secondary side of the isolation optocoupler chip U5 is connected with an emergency stop terminal at a control end of a test product.
The signal input end of the overcurrent detection module is connected with the redundancy protection module, and the signal output end of the overcurrent detection module is connected with the cathode of an isolation optocoupler chip U5 of the alarm module; when the detection current exceeds the threshold value, a low level is output to the cathode of the isolation optocoupler chip U5.
The signal output end of the temperature detection alarm module is connected with the cathode of an isolation optocoupler chip U5 of the alarm module; when the detected temperature exceeds the overturning threshold value, a low level is output to the cathode of the isolation optocoupler chip U5.
The signal input end of the voltage conversion module is connected with the signal output end of the over-redundancy protection module, and the signal output end of the voltage conversion module is connected with the signal input end of the alarm module and used for supplying power to the alarm module, the over-current detection module and the temperature detection alarm module.
When the cathode of an isolation optocoupler chip U5 of the alarm module receives a low level, a light emitting diode LED1 flashes for alarm to remind of abnormal temperature; and meanwhile, after the emergency stop terminal of the test product receives a signal of the conduction of the secondary side of the isolation optocoupler chip U5, the emergency stop terminal of the test product controls the product to stop.
Specifically, as shown in fig. 4 and fig. 9, the group of overvoltage protection modules includes a voltage comparator U4, a positive phase input terminal and a negative phase input terminal of the voltage comparator U4 are respectively connected to the positive electrodes of the group of power input interfaces through a resistor R15 and a resistor R14, and are respectively grounded through a resistor R21 and a zener diode Z2; the positive power supply end of the voltage comparator U4 is connected with the positive electrode of the power supply input interface, the negative power supply end is grounded, the output end of the voltage comparator U4 is connected with the contact end of the control switch Q2 through a resistor R17, and meanwhile, the resistor R17 is connected with the positive electrode of the power supply input interface after being connected with a Zener diode Z1 in series; the signal input end of the control switch Q2 is connected with the positive pole of the power input interface, and the output end is connected with the input end of the redundancy protection module.
The other group of overvoltage protection modules comprises a voltage comparator U6, wherein a positive phase input end and a negative phase input end of the voltage comparator U6 are respectively connected with the positive electrode of the other group of power input interfaces through a resistor R27 and a resistor R26 and are respectively grounded through a resistor R32 and a Zener diode Z4; the positive power supply end of the voltage comparator U4 is connected with the positive electrode of the power supply input interface, the negative power supply end is grounded, the output end of the voltage comparator U4 is connected with the contact end of the control switch Q4 through a resistor R28, and meanwhile, the resistor R28 is connected with the positive electrode of the power supply input interface after being connected with a Zener diode Z3 in series; the signal input end of the control switch Q4 is connected with the positive pole of the power input interface, and the output end is connected with the input end of the redundancy protection module.
The overvoltage protection circuit is controlled by a high voltage comparator, a control switch Q2 and a control switch Q4 (MOSFETs) connecting the power supply to the load, the comparator outputting a high level when the power supply output exceeds an overvoltage threshold and disconnecting the load and the power supply by means of MOSFETs.
Specifically, as shown IN fig. 7, the redundancy protection module includes a multi-source multiplexer U3, an IN1 interface of the multi-source multiplexer U3 is connected to an output terminal of a control switch Q2, an IN2 interface is connected to an output terminal of a control switch Q4, and an OUT interface is connected to the voltage conversion module and the overcurrent protection module.
Furthermore, an OV1 interface of the multi-source multiplexer U3 is connected with the output end of the control switch Q2 through a resistor R11, and the resistor R11 is grounded through a resistor R18; the PRI interface of the multi-source multiplexer U3 is connected with the output end of the control switch Q2 through a resistor R10, the ST interface thereof is connected with the output end of the control switch Q2 through a resistor R13 and a resistor R10, and a resistor R10 is grounded through a resistor R12; the IN2 interface of the multi-source multiplexer U3 is grounded through a resistor R23 and a resistor R25, the OV2 interface thereof is grounded through a resistor R25, the ILM interface thereof is grounded through a resistor 24, and the SS interface is grounded through a capacitor C6.
The redundant protection module provided by the embodiment has the advantages that when one power supply fails, the system is automatically switched to the standby power supply and provides uninterrupted power supply for the downstream load, so that data loss is prevented. Seamless switching between power supplies while minimizing output voltage dips. Therefore, the redundancy protection module can ensure that when one power supply fails, the system can be automatically switched to the other power supply, and the working current limitation, the overvoltage protection and the always-on reverse current protection function can reduce the pressure of the system and prevent the occurrence of unexpected reverse current. Seamless switching, priority power supply selection, overvoltage protection, current limitation, hot plug protection, input stability approaching and soft start control can be realized by 5 mus switching time and external voltage reference.
Specifically, as shown in fig. 6, the overcurrent detection module includes a current detection amplifier U1, and a sampling resistor R3 is connected in parallel between an INP interface and an INN interface of the current detection amplifier U1; an INP interface of the current detection amplifier U1 is connected with an OUT interface of the multi-source multiplexer U3, and an INN interface is connected with a power supply end of an isolation optocoupler chip U5 of the alarm module; an ALERT interface of the current detection amplifier U1 is connected with a cathode of an isolation optocoupler chip U5 of the alarm module.
Furthermore, the VOUT interface of the current detection amplifier U1 is connected with the CMPIN interface in series through a resistor R4, and the CMPREF interface is connected with a 5V power supply through a resistor R7 and grounded through a resistor R9; the ALERT interface is connected with a 5V power supply through a resistor R2, and is grounded after being connected with a light emitting diode D1 and a resistor R1 in series through a Mosfet tube Q1; the VS interface is connected to ground through a capacitor C1. When overcurrent protection occurs, the light emitting diode D1 lights up to play a role of indication.
The overcurrent condition is detected by measuring the voltage across the sampling resistor R3 by the current sense amplifier U1 of the overcurrent detection module and comparing this voltage to a user-defined threshold limit (set by the comparator reference pin), the independent comparator large signal alarm response time is less than 2 μ s, the overcurrent event can be detected quickly, and the total system overcurrent protection response time is less than 10 μ s.
After overcurrent protection (current exceeds 10A, and the light emitting diode lights) occurs in the circuit provided by the device, the isolation optocoupler chip U5 of the alarm module is conducted, the light emitting diode LED1 flickers to give an alarm to remind a worker to cut off the power supply of a tested product, the device breaks down on behalf, and meanwhile, the emergency stop terminal of the tested product receives a signal that the auxiliary side of the isolation optocoupler chip U5 is conducted, and then the emergency stop terminal of the tested product controls the product to stop.
Specifically, as shown in fig. 5, the voltage conversion module includes a buck converter U2, a Vin interface of the buck converter U2 is connected to an OUT interface of the multi-source multiplexer U3, and an Vout interface is connected to an input end of an isolation optocoupler chip U5 of the alarm module to supply power to the alarm module and the temperature detection alarm module.
Furthermore, a capacitor C2 and a capacitor C3 are connected in parallel with a connection circuit of the buck converter U2 and the multi-source multiplexer U3, an SS/TR interface of the buck converter U2 is connected with the capacitor C2 and the capacitor C3 through a capacitor C5, and is grounded through a capacitor C5; the PG interface and the FB interface of the buck converter U2 are connected in series and then connected in parallel with the Vout interface through a resistor R5 and a resistor R6, the Vout interface is grounded through a capacitor C4, one end of the resistor R6 is connected with a 5V power supply, and the other end of the resistor R6 is grounded through an R8.
The voltage conversion module provided by the embodiment has the functions of reducing voltage and protecting the voltage and converting the voltage into the power supply of the temperature protection module and the alarm module after the redundant power supply protection, and the module automatically enters a power saving mode under light load current, so that the voltage is accurately output due to ultralow static working current.
Specifically, as shown in fig. 3, the temperature detection alarm module includes a voltage comparator U7, a non-inverting input terminal of the voltage comparator U7 is connected to a 5V power supply through resistors R31 and R29, and is also connected to a thermistor NTC1 through a resistor R31; the inverting input end of the capacitor is connected with a 5V power supply through a resistor R35, and is grounded through a resistor R36 and a capacitor C10 which are connected in parallel; a capacitor C8 is also connected in parallel between the thermistor NTC1 and the resistor R31, and a capacitor C7 is also connected in parallel between the non-inverting input end of the voltage comparator U7 and the resistor R31; the positive power supply of the voltage comparator U7 is connected with a 5V power supply, the negative power supply is grounded, and the output end of the voltage comparator U7 is connected with the cathode of an isolation optocoupler chip U5 of the alarm module through a resistor R34; a resistor R30 is connected in series between the non-inverting input end and the output end of the voltage comparator U7, one end of R30 is positioned between the output end of the voltage comparator U7 and the resistor R34, a resistor R33 is also connected in parallel between the resistor R30 and the resistor R34, and a capacitor C9 is also connected in series behind the resistor R34.
The temperature detection alarm module provides a hysteresis function and selects a 100K resistor. The resistor R34 and the capacitor C9 form output low-pass filtering, and the resistor R31 and the capacitor C7 perform low-pass filtering to filter interference signals.
Temperature detection alarm module's thermistor NTC1 detects the temperature, because the low experiment of high temperature generally needs long-time verification, select for use the powerful voltage comparator of low-power consumption low offset voltage function (temperature range-40 degrees to +125 degrees), when the temperature surpassed the upset threshold value, voltage comparator U7 negative terminal output low level, carry the negative pole of keeping apart opto-coupler chip U5, emitting diode LED1 scintillation reports to the police, remind the staff in time to investigate the fault reason, simultaneously test product emergency stop terminal receives keep apart opto-coupler chip U5 secondary side behind the signal that switches on, the emergency stop terminal control product of test product is shut down, avoids the chip to be burnt out. The temperature of this embodiment is about 95 degrees, and the/OH end of temperature detection alarm module exports low level.
Specifically, as shown in fig. 8, the secondary side of the isolation optocoupler chip U5 is connected with the light emitting diode LED1 and the resistor R16 in sequence, and then connected with the INN interface of the current detection amplifier U1, and the cathode is connected with the resistor R34 of the temperature detection alarm module and the ALERT interface of the current detection chip U1 through the resistor R20 and the resistor R19, respectively; the anode of the isolation optocoupler chip U5 is connected with the Vout interface of the buck converter U2, and the output end J2 is grounded through a resistor R22.
The working principle of the high-temperature test reliability protection circuit provided by the embodiment is as follows:
the temperature protection reliability device is provided with two paths of power supplies through two overvoltage protection modules, and then protection is respectively carried out firstly (overvoltage is carried out, so that chips of subsequent circuits are prevented from being damaged, and high voltage is isolated); the input of the protected voltage into the redundancy protection module can ensure that when one power supply fails, the other power supply is automatically switched to, and the power supplies are seamlessly switched, so that the voltage drop is reduced to the maximum extent, and the temperature protection device is always in a power supply state; after redundancy protection, overcurrent protection is carried out on the device through an overcurrent detection module, the current of a design value exceeds 10A, and the module outputs a low level; when the temperature detection alarm module monitors a temperature value of more than 95 ℃, outputting a low level; the monitoring value of overcurrent protection and the monitoring value of temperature protection, double-circuit protection value all converge alarm module and make emitting diode LED1 scintillation report to the police, remind the staff that the experimental temperature is unusual, should in time troubleshoot the fault reason, or take other safeguard procedures for experimental safe and reliable more.
The invention does not need software control, uses pure hardware to realize the protection function, has high reliability, is not influenced by communication interference, crash and power failure of an upper computer, is beneficial to improving the safety of electronic products, improves the research and development progress of the products and avoids frequently damaging test prototypes.
The above embodiments are only preferred embodiments of the present invention, the scope of protection of the present invention is not limited thereto, and any person skilled in the art can obviously obtain simple changes or equivalent replacements of the technical solutions within the technical scope of the present invention.
Claims (10)
1. A high temperature test reliability protection circuit, comprising:
the signal input ends of the two overvoltage protection modules are respectively connected with the two groups of power supply input interfaces and used for detecting the voltage value of an input power supply; when the power supply fails, interrupting the power supply;
the signal input end of the redundancy protection module is connected with the signal output ends of the two overvoltage protection modules and is used for automatically switching the power supplies when one group of power supplies fails;
the alarm module comprises an isolation optocoupler chip U5 and a light emitting diode LED1 which are sequentially connected, and the secondary side of the isolation optocoupler chip U5 is connected with an emergency stop terminal controlled by a test product;
the signal input end of the overcurrent detection module is connected with the redundancy protection module, and the signal output end of the overcurrent detection module is connected with the cathode of an isolation optocoupler chip U5 of the alarm module; when the detection current exceeds a threshold value, outputting a low level to a cathode of an isolation optocoupler chip U5;
the signal output end of the temperature detection alarm module is connected with the cathode of an isolation optocoupler chip U5 of the alarm module; when the detected temperature exceeds the turnover threshold, outputting a low level to a cathode of an isolation optocoupler chip U5;
the signal input end of the voltage conversion module is connected with the signal output end of the redundancy protection module, and the signal output end of the voltage conversion module is connected with the signal input end of the alarm module and used for supplying power to the alarm module, the overcurrent detection module and the temperature detection alarm module;
when the cathode of an isolation optocoupler chip U5 of the alarm module receives a low level, the light emitting diode LED1 flashes for alarm to remind abnormal temperature; meanwhile, after the emergency stop terminal of the test product receives a signal for conducting the secondary side of the isolation optocoupler chip U5, the emergency stop terminal of the test product controls the product to stop.
2. The reliability protection circuit for high temperature test as claimed in claim 1, wherein a group of the overvoltage protection modules comprises a voltage comparator U4, a positive phase input terminal and a negative phase input terminal of the voltage comparator U4 are respectively connected to anodes of a group of the power input interfaces through a resistor R15 and a resistor R14, and are respectively connected to ground through a resistor R21 and a zener diode Z2; the positive power supply end of the voltage comparator U4 is connected with the positive electrode of the power supply input interface, the negative power supply end is grounded, the output end of the voltage comparator U4 is connected with the contact end of the control switch Q2 through a resistor R17, and meanwhile, the resistor R17 is connected with the positive electrode of the power supply input interface after being connected with a Zener diode Z1 in series; the signal input end of the control switch Q2 is connected with the positive electrode of the power input interface, and the output end of the control switch Q2 is connected with the input end of the redundancy protection module;
the other group of overvoltage protection modules comprises a voltage comparator U6, wherein a positive phase input end and a negative phase input end of the voltage comparator U6 are respectively connected with the positive electrode of the other group of power supply input interfaces through a resistor R27 and a resistor R26, and are respectively grounded through a resistor R32 and a Zener diode Z4; the positive power supply end of the voltage comparator U4 is connected with the positive electrode of the power supply input interface, the negative power supply end is grounded, the output end of the voltage comparator U4 is connected with the contact end of the control switch Q4 through a resistor R28, and meanwhile, the resistor R28 is connected with the positive electrode of the power supply input interface after being connected with a Zener diode Z3 in series; and the signal input end of the control switch Q4 is connected with the positive electrode of the power supply input interface, and the output end of the control switch Q4 is connected with the input end of the redundancy protection module.
3. The HTC reliability protection circuit of claim 2, wherein said redundancy protection module comprises a multi-source multiplexer U3, an IN1 interface of said multi-source multiplexer U3 being connected to an output of said control switch Q2, an IN2 interface being connected to an output of said control switch Q4, and an OUT interface being connected to said voltage conversion module and said overcurrent protection module.
4. The high temperature test reliability protection circuit of claim 3, wherein the OV1 interface of the multi-source multiplexer U3 is connected with the output terminal of the control switch Q2 through a resistor R11, and the resistor R11 is grounded through a resistor R18;
the PRI interface of the multi-source multiplexer U3 is connected with the output end of the control switch Q2 through a resistor R10, the ST interface thereof is connected with the output end of the control switch Q2 through a resistor R13 and a resistor R10, and the resistor R10 is grounded through a resistor R12;
the IN2 interface of the multi-source multiplexer U3 is grounded through a resistor R23 and a resistor R25, the OV2 interface thereof is grounded through a resistor R25, the ILM interface thereof is grounded through a resistor 24, and the SS interface thereof is grounded through a capacitor C6.
5. The high-temperature test reliability protection circuit according to claim 3, wherein the over-current detection module comprises a current detection amplifier U1, and a sampling resistor R3 is connected in parallel between an INP interface and an INN interface of the current detection amplifier U1; an INP interface of the current detection amplifier U1 is connected with an OUT interface of the multi-source multiplexer U3, and an INN interface is connected with a power supply end of an isolation optocoupler chip U5 of the alarm module; an ALERT interface of the current detection amplifier U1 is connected with a cathode of an isolation optocoupler chip U5 of the alarm module.
6. The reliability protection circuit for high temperature test as claimed in claim 5, wherein the VOUT interface of the current detection amplifier U1 is connected in series with the CMPIN interface through a resistor R4, and the CMPREF interface thereof is connected to the 5V power supply through a resistor R7 and to the ground through a resistor R9; the ALERT interface is connected with a 5V power supply through a resistor R2, and is grounded after being connected with a light emitting diode D1 and a resistor R1 in series through a Mosfet tube Q1; the VS interface is connected to ground through a capacitor C1.
7. The high-temperature test reliability protection circuit as claimed in claim 5, wherein the voltage conversion module includes a buck converter U2, a Vin interface of the buck converter U2 is connected with an OUT interface of the multi-source multiplexer U3, and a Vout interface is connected with an input end of an isolation optical coupling chip U5 of the alarm module, so as to supply power to the alarm module and the temperature detection alarm module.
8. The reliability protection circuit for high temperature tests as claimed in claim 7, wherein the connection circuit of the buck converter U2 and the multi-source multiplexer U3 is connected with a capacitor C2 and a capacitor C3 in parallel, and the SS/TR interface of the buck converter U2 is connected with a capacitor C2 and a capacitor C3 through a capacitor C5 and is grounded through a capacitor C5; the PG interface and the FB interface of the buck converter U2 are connected in series, and then a resistor R5 and a resistor R6 are connected in parallel between the PG interface and the Vout interface, the Vout interface is grounded through a capacitor C4, one end of the resistor R6 is connected with a 5V power supply, and the other end of the resistor R6 is grounded through R8.
9. The high-temperature test reliability protection circuit as claimed in claim 7, wherein the temperature detection alarm module comprises a voltage comparator U7, the non-inverting input terminal of the voltage comparator U7 is connected to a 5V power supply through resistors R31 and R29, and is also connected to a thermistor NTC1 through a resistor R31; the inverting input end of the capacitor is connected with a 5V power supply through a resistor R35, and is grounded through a resistor R36 and a capacitor C10 which are connected in parallel; a capacitor C8 is connected in parallel between the thermistor NTC1 and the resistor R31, and a capacitor C7 is connected in parallel between the non-inverting input end of the voltage comparator U7 and the resistor R31;
the positive power supply of the voltage comparator U7 is connected with a 5V power supply, the negative power supply is grounded, and the output end of the voltage comparator U7 is connected with the cathode of an isolation optocoupler chip U5 of the alarm module through a resistor R34;
a resistor R30 is connected in series between the non-inverting input end and the output end of the voltage comparator U7, one end of the resistor R30 is located between the output end of the voltage comparator U7 and the resistor R34, a resistor R33 is connected in parallel between the resistor R30 and the resistor R34, and a capacitor C9 is connected in series behind the resistor R34.
10. The high-temperature test reliability protection circuit according to claim 9, wherein a secondary side of the isolation optocoupler chip U5 is connected with an INN interface of the current detection amplifier U1 after being sequentially connected with a light emitting diode LED1 and a resistor R16, and a cathode is connected with a resistor R34 of the temperature detection alarm module and an ALERT interface of the current detection chip U1 through a resistor R20 and a resistor R19, respectively;
the anode of the isolation optocoupler chip U5 is connected with the Vout interface of the buck converter U2, and the output end J2 is grounded through a resistor R22.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220916324.XU CN217332573U (en) | 2022-04-20 | 2022-04-20 | High-temperature test reliability protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220916324.XU CN217332573U (en) | 2022-04-20 | 2022-04-20 | High-temperature test reliability protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217332573U true CN217332573U (en) | 2022-08-30 |
Family
ID=82947387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220916324.XU Active CN217332573U (en) | 2022-04-20 | 2022-04-20 | High-temperature test reliability protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217332573U (en) |
-
2022
- 2022-04-20 CN CN202220916324.XU patent/CN217332573U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101630854B (en) | Uninterrupted power supply and method for detecting bypass fault of uninterrupted power supply | |
| CN203198756U (en) | Monitoring and alarm device for electric car high-tension distribution system | |
| CN102709901B (en) | Current transformer over-voltage protection method and device | |
| CN107290630A (en) | Detector for electric fire protection circuit | |
| CN218866065U (en) | Fault abnormal state holding circuit, device and robot | |
| CN106405441A (en) | Aging testing device for optical module | |
| CN102496920B (en) | Surge protection device and method for detecting faults by using surge protection device | |
| CN104392757A (en) | DCS for nuclear power station | |
| CN207007986U (en) | Detector for electric fire protection circuit | |
| CN217332573U (en) | High-temperature test reliability protection circuit | |
| CN103723045A (en) | Monitoring and alarming device for electric vehicle high-voltage power distribution systems | |
| CN201674275U (en) | Double-power-source automatic switching loop | |
| CN211720255U (en) | Signal machine self-fusing circuit based on fault safety | |
| CN117458405A (en) | Multiple fault protection system based on AFE chip | |
| CN203071901U (en) | Three-phase solid-state relay | |
| CN100452599C (en) | Protection method for detecting power module outlet internal short-circuit and detection protecting circuit | |
| CN102005912A (en) | Double overcurrent protection circuit of sine wave inverter | |
| CN101902033A (en) | Intelligent protection device with zero pressure drop | |
| CN204333893U (en) | A kind of power circuit short protective device | |
| CN203606919U (en) | Multipath digital transmission electrical fire hazard monitoring system | |
| CN101256705A (en) | Equipment control system alarming device with voice and remote prompting control | |
| CN109193924A (en) | Dual power supply system automatic switching device | |
| CN100464477C (en) | Output overvoltage detection protecting method for power supply system | |
| CN114778926B (en) | High-reliability device applied to temperature test | |
| CN206193213U (en) | Aging testing device of optical module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |