CN211206742U - Power-on buffer circuit and product testing device - Google Patents
Power-on buffer circuit and product testing device Download PDFInfo
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- CN211206742U CN211206742U CN201921737837.9U CN201921737837U CN211206742U CN 211206742 U CN211206742 U CN 211206742U CN 201921737837 U CN201921737837 U CN 201921737837U CN 211206742 U CN211206742 U CN 211206742U
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Abstract
The utility model relates to a product test technical field provides last electric buffer circuit and product testing device. The power-up buffer circuit includes: the power supply, the buffer unit, the power supply control unit, the switch unit and the output port; the power supply is connected with the output port through the buffer unit, and the output port is used for being connected with an external test product; the switch unit is connected with the buffer unit in parallel; the input end of the power supply control unit is connected between the buffer unit and the output port, and the output end of the power supply control unit is connected with the switch unit; the power supply control unit controls the opening and closing of the switch unit according to the voltage of the output port, and the buffer unit is short-circuited after the switch unit is closed. The power-on buffer circuit can realize the power-on automatic buffering of the power supply on the test product, and reduce the damage to the test product.
Description
Technical Field
The utility model belongs to the technical field of product test, especially, relate to go up electric buffer circuit and product testing device.
Background
For test products such as a UPS (uninterruptible power supply), an SPI (serial peripheral Interface) and the like which need high-voltage direct-current power supply debugging and aging, the test products such as the UPS and the SPI are generally powered up and buffered by a manual control switch, so that a risk of manual misoperation exists, and quality damage is easily caused to the test products such as the UPS and the SPI.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a go up electric buffer circuit and product testing device to manual control switch carries out the problem that the electric buffering caused the quality to damage easily to the test product among the solution prior art.
The embodiment of the utility model provides a first aspect provides an go up electric buffer circuit, include: the power supply, the buffer unit, the power supply control unit, the switch unit and the output port; the power supply is connected with the output port through the buffer unit, and the output port is used for being connected with an external test product; the switch unit is connected with the buffer unit in parallel; the input end of the power supply control unit is connected between the buffer unit and the output port, and the output end of the power supply control unit is connected with the switch unit; the power supply control unit controls the opening and closing of the switch unit according to the voltage of the output port, and the buffer unit is short-circuited after the switch unit is closed.
Optionally, the power control unit includes a voltage sampling circuit, a control circuit, and a conversion output circuit;
the voltage sampling circuit collects the voltage between the buffer unit and the output port, the control circuit generates a switch control signal according to the voltage collected by the voltage sampling circuit, and the conversion output circuit converts the switch control signal and then sends the converted switch control signal to the switch unit.
Optionally, the power control unit further includes a filter circuit for filtering a current input to the power control unit, and the current filtered by the filter circuit enters the voltage sampling circuit for voltage sampling.
Optionally, the switch unit is a contactor.
Optionally, the switch control signal is a voltage signal, and the closing action voltage of the contactor is equal to the voltage output by the switch control signal through the conversion output circuit.
Optionally, the contactor includes a main contact and an auxiliary contact, and the main contact of the contactor is closed under the control of the switch control signal;
the switch unit further comprises an indicator light connected with the auxiliary contact of the contactor and controlled by the contactor; and after the main contact is attracted and the auxiliary contact is attracted, the indicator lamp starts to work.
Optionally, the power supply is a dc power supply, and the switch unit is a high-voltage dc contactor.
Optionally, the buffer unit includes a buffer resistor.
Optionally, the buffer unit further includes an overcurrent protection device connected in series with the buffer resistor.
The embodiment of the utility model provides a second aspect provides product testing device, include the embodiment of the utility model provides an arbitrary kind of power-on buffer circuit in the first aspect.
The embodiment of the utility model provides a, voltage boost output direct current voltage after the power is started, direct current voltage reaches external test product direct current input end through the buffer unit earlier and reaches the input of power control unit simultaneously; after the voltage rises and is buffered by the buffer unit, the power supply control unit triggers the control signal to close the switch unit after detecting that the working voltage of the input end reaches a certain value, and the buffer unit is short-circuited and the buffer work is finished, so that the power supply can automatically buffer the power-on of a test product, and the test product cannot be damaged in quality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a structural diagram of a power-on buffer circuit provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a power-on buffer circuit provided by an embodiment of the present invention;
fig. 3 is a structural diagram of a power supply control unit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Referring to fig. 1, the power-on buffer circuit in the embodiment of the present invention may include a power supply 100, a buffer unit 200, a power control unit 300, a switch unit 400, and an output port. The power supply 100 is connected to the output port through the buffer unit 200, and the output port is used for being connected to an external test product 500; the switching unit 400 is connected in parallel with the buffering unit 200; the input end of the power control unit 300 is connected between the buffer unit 200 and the output port, and the output end of the power control unit 300 is connected to the switch unit 400; the power control unit 300 controls the switching unit 400 to be turned on and off according to the voltage of the output port, and the buffer unit is short-circuited after the switching unit is turned on.
In the power-on buffer circuit, after the power supply 100 is started, the voltage rises to output a direct current voltage, and the direct current voltage firstly reaches the direct current input end of the external test product 500 through the buffer unit 200 and simultaneously reaches the input end of the power supply control unit 300; as the voltage rises and is buffered by the buffer unit 200, after the power control unit 300 detects a certain working voltage value, the control switch unit 400 is turned on, and at this time, the buffer unit 200 is short-circuited, and the power-on buffering work is completed, so that the power supply 100 can automatically buffer the power-on of the test product 500 without causing quality damage to the test product 500.
In some embodiments, the buffer unit 200 may include a buffer resistor. The buffer resistor may be a single resistor, or may be a resistor unit formed by connecting a plurality of resistors in series, parallel, or series-parallel, which is not limited. Illustratively, referring to fig. 2, the snubber resistor may include a resistor R1.
Optionally, the buffer unit 200 may further include an overcurrent protection device connected in series with the buffer resistor. The over-current protection device may be turned off to protect the buffer unit 200 when the buffer unit 200 receives a large current. The over-current protection device may be, for example and without limitation, a fuse or a fuse.
Referring to fig. 3, as an exemplary embodiment, the power control unit 300 may include a circuit board, and a voltage sampling circuit 310, a control circuit 320, and a conversion output circuit 330 integrally disposed on the circuit board.
The voltage sampling circuit 310 collects the voltage of the output port, the control circuit 320 generates a switch control signal according to the voltage collected by the voltage sampling circuit 310, and the conversion output circuit 330 converts the switch control signal and then sends the converted switch control signal to the switch unit 400.
Optionally, the power control unit 300 may further include a filter circuit 340 for filtering a current input to the power control unit 300, and the current filtered by the filter circuit 340 enters the voltage sampling circuit 310 for voltage sampling.
Referring to fig. 2, in some embodiments, the switching unit 400 may include a contactor 401. One end of a main contact of the contactor 401 is connected with the power supply 100, the other end of the main contact is connected with the output port, and the main contact of the contactor 401 is attracted under the control of the switch control signal; the control terminal of the contactor 401 is connected to the power control unit 300. After the power supply control unit 300 detects a certain working voltage, the contactor is triggered to act and output voltage-stabilizing voltage of 24V; the 24V output of the power control unit 300 will control the main contact of the contactor of the main circuit to close, at this time, the buffer unit 200 is short-circuited, and the power-on buffering operation is completed.
In this embodiment, the switch control signal may be a voltage signal, and the closing operation voltage of the contactor is equal to the voltage output by the switch control signal through the conversion output circuit.
Optionally, the contactor 401 includes a main contact and an auxiliary contact, and the main contact of the contactor 401 is closed under the control of the switch control signal. The switching unit 400 may further include an indicator lamp 402 connected to the auxiliary contact of the contactor 401 and controlled by the contactor 401 connection. Wherein, after the main contact is closed and the auxiliary contact is closed, the indicator light 402 starts to work.
Alternatively, the power supply 100 may be a dc power supply, and the contactor may be a high-voltage dc contactor.
The working process of the power-on buffer circuit is as follows:
after the power supply 100 is started, the voltage rises to output direct current voltage;
the direct current voltage firstly reaches the direct current input end of the external test product 500 through the buffer resistor R1 and the overcurrent protection device, and simultaneously reaches the input end of the power supply control unit 300;
after the voltage rises and is buffered by the buffer resistor R1, the power control unit 300 detects a certain working voltage, and then triggers the relay on the circuit board to act, so as to stabilize the voltage and output a preset voltage (for example, 24V); the preset voltage output of the power control unit 300 closes the main contact of the high-voltage direct-current contactor for controlling the main loop, at the moment, the buffer resistor R1 is short-circuited, the power-on buffer work is completed, and the main loop receives a large current from the main contact of the high-voltage direct-current contactor;
after the main contact of the high-voltage direct-current contactor of the main circuit is controlled to be closed, the auxiliary contact of the high-voltage direct-current contactor is also simultaneously closed, the indicating lamp 402 is switched on through the auxiliary contact to work, and the fact that the main circuit enters normal work is proved at the moment;
if the indicator light 402 is not lit, it indicates that the dc contactor 401 or the power control unit 300 is failed, the buffer unit 200 carries a large current in the debugging and aging processes of the test product, and when the passing current exceeds the rated current value of the overcurrent protection device, the overcurrent protection device can be automatically fused, so that the buffer unit 200 is protected, and accidents such as fire and the like caused by continuous heating of the buffer resistor R1 are avoided.
Corresponding to above-mentioned arbitrary kind of power-on buffer circuit, the embodiment of the utility model provides a product testing device is still provided, this product testing device includes above-mentioned arbitrary kind of power-on buffer circuit, and has the above-mentioned advantage that power-on buffer circuit had, no longer gives unnecessary details here.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A power-up buffer circuit, comprising: the power supply, the buffer unit, the power supply control unit, the switch unit and the output port; the power supply is connected with the output port through the buffer unit, and the output port is used for being connected with an external test product; the switch unit is connected with the buffer unit in parallel; the input end of the power supply control unit is connected between the buffer unit and the output port, and the output end of the power supply control unit is connected with the switch unit;
wherein the power control unit controls the opening and closing of the switch unit according to the voltage of the output port, and the buffer unit is short-circuited after the switch unit is closed.
2. The power-on buffer circuit of claim 1, wherein the power control unit comprises a circuit board, and a voltage sampling circuit, a control circuit, and a conversion output circuit integrally disposed on the circuit board;
the voltage sampling circuit collects the voltage of the output port, the control circuit generates a switch control signal according to the voltage collected by the voltage sampling circuit, and the conversion output circuit converts the switch control signal and then sends the converted switch control signal to the switch unit.
3. The power-on buffer circuit of claim 2, wherein the power control unit further comprises a filter circuit for filtering the voltage input to the power control unit, and the voltage filtered by the filter circuit enters the voltage sampling circuit for voltage sampling.
4. The power-on buffer circuit of claim 2, wherein the switch unit comprises a contactor.
5. The power-on buffer circuit of claim 4, wherein the switch control signal is a voltage signal, and wherein a closing action voltage of the contactor is equal to a voltage of the switch control signal output by the switching output circuit.
6. The power-on buffer circuit of claim 4, wherein the contactor includes a main contact and an auxiliary contact, the main contact of the contactor being closed under control of the switch control signal;
the switch unit further comprises an indicator light connected with the auxiliary contact of the contactor and controlled by the contactor; and after the main contact is attracted and the auxiliary contact is attracted, the indicator lamp starts to work.
7. The power-on buffer circuit of claim 4, wherein the power source is a DC power source and the switching unit is a high-voltage DC contactor.
8. The power-on buffer circuit according to any of claims 1 to 7, wherein the buffer unit comprises a buffer resistor.
9. The power-on buffer circuit of claim 8, wherein the buffer cell further comprises an over-current protection device in series with the buffer resistor.
10. A product testing apparatus comprising the power-on buffer circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921737837.9U CN211206742U (en) | 2019-10-16 | 2019-10-16 | Power-on buffer circuit and product testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921737837.9U CN211206742U (en) | 2019-10-16 | 2019-10-16 | Power-on buffer circuit and product testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211206742U true CN211206742U (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921737837.9U Active CN211206742U (en) | 2019-10-16 | 2019-10-16 | Power-on buffer circuit and product testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211206742U (en) |
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2019
- 2019-10-16 CN CN201921737837.9U patent/CN211206742U/en active Active
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