CN202696138U - Excess voltage absorption protection circuit capable of accurately presetting protection value - Google Patents
Excess voltage absorption protection circuit capable of accurately presetting protection value Download PDFInfo
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- CN202696138U CN202696138U CN 201220260345 CN201220260345U CN202696138U CN 202696138 U CN202696138 U CN 202696138U CN 201220260345 CN201220260345 CN 201220260345 CN 201220260345 U CN201220260345 U CN 201220260345U CN 202696138 U CN202696138 U CN 202696138U
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Abstract
The utility model discloses an excess voltage absorption protection circuit capable of accurately presetting a protection value. The excess voltage absorption protection circuit consists of a protection absorption component unit, a reference voltage, a comparator, an electric control switch, a capacitor and three resistors. By using the excess voltage absorption protection circuit, an absorption protection component can be connected to a two-port network in which a spike voltage is positioned at the moment when the condition that a voltage spike exceeds a preset safe voltage occurs; the energy of the spike is absorbed; meanwhile, a spike voltage value is restrained; the effect of protecting a component in the circuit is realized; and when the spike voltage at two ends of the two-port network is decreased to a value considered to be safe, the absorption protection component is quickly switched out of the circuit, so that the absorption protection component does not influence the normal work of the circuit.
Description
Technical field
The utility model relates to a kind of voltage protection field, is specifically related to a kind of overvoltage that can accurately preset the protection value and absorbs protective circuit.
Background technology
Often the meet working condition of Lingao due to voltage spikes of components and parts in the power converter apparatus (such as Switching Power Supply, inverter etc.); in order to make element be unlikely in the course of the work to damage, usually need to be at the Position Design excess voltage protection that has easily the high pressure spike to produce.Traditional high pressure spike protective circuit is made of passive devices such as MOV, TVS pipe, gas discharge tube usually; these elements often can absorb larger energy; but because the restriction of element material and manufacturing process; the parameter of element often error is larger, therefore can not accurately hold the magnitude of voltage that element carries out overvoltage protection design circuit.The protection value deviation that causes side circuit overvoltage protection value and preset is larger.
The utility model content
The purpose of this utility model is to overcome the above problem that prior art exists; provide a kind of overvoltage that can accurately preset the protection value to absorb protective circuit; the utility model can accurately be preset the magnitude of voltage that need to carry out overvoltage protection; so that protective circuit can be when peak voltage reaches the default value of designer the starting protection absorption function, and then the element in the protection power converter apparatus is avoided damaging.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the utility model is achieved through the following technical solutions:
A kind of overvoltage that can accurately preset the protection value absorbs protective circuit; by protection absorber element unit; reference voltage; comparator; electric-controlled switch; electric capacity and three resistance form; the A of described protection absorber element unit end and described the second resistance be connected the first resistance and be connected; described the second resistance and described the 3rd resistance be connected comparator and be connected; described the 3rd resistance is connected with the B end of described protection absorber element unit; described comparator one end is connected with described reference voltage; described reference voltage is connected with the B end of described protection absorber element unit; the described comparator other end is connected with described electric-controlled switch; described the first resistance is parallel with described electric capacity; described the first resistance is connected with described electric-controlled switch, and described electric-controlled switch is connected with the B end of described protection absorber element unit.
Further, described electric-controlled switch is comprised of semiconductor switch device or relay element.
The beneficial effects of the utility model are:
Can allow absorb protection component and surpass the two-port network that default safe voltage moment is linked into the peak voltage place due to voltage spikes occurring, absorb the energy of spike, suppress simultaneously the peak voltage value, play the effect of element in the protective circuit.And when the peak voltage at two-port network two ends drops to the value of thinking safe, will absorb rapidly protection component to cut out circuit, do not absorb the normal operation that protection component affects circuit and do not allow.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and cooperate accompanying drawing to be described in detail as follows.Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is system block diagram of the present utility model;
Fig. 2 is a kind of embodiment of the present utility model;
Fig. 3 is the schematic diagram of the utility model when equipment works without peak voltage;
Fig. 4 is the working condition the utility model will absorb access AB two ends, protection component unit after peak voltage is greater than preset value after;
Fig. 5 is that electric-controlled switch S1 opened a way after peak voltage of the present utility model dropped to preset value.
Number in the figure explanation: R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, C1, the first electric capacity, U1, comparator, S1, electric-controlled switch, C, protection absorber element unit.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
With reference to shown in Figure 1; a kind of overvoltage that can accurately preset the protection value absorbs protective circuit; by protection absorber element unit C; reference voltage vref; comparator U1; electric-controlled switch S1; capacitor C 1 and three resistance R 1; R2; R3 forms; the A of described protection absorber element unit C end and described the second resistance R 2 be connected the first resistance R 1 and be connected; described the second resistance R 2 and described the 3rd resistance R 3 be connected comparator U1 and be connected; described the 3rd resistance R 3 is connected with the B end of described protection absorber element unit C; described comparator U1 one end is connected with described reference voltage vref; described reference voltage vref is connected with the B end of described protection absorber element unit C; the described comparator U1 other end is connected with described electric-controlled switch S1; described the first resistance R 1 is parallel with described capacitor C 1; described the first resistance R 1 is connected with described electric-controlled switch S1, and described electric-controlled switch S1 is connected with the B end of described protection absorber element unit C.
Further, described electric-controlled switch S1 is comprised of semiconductor switch device or relay element.
The operation principle of present embodiment is as follows:
When power converter apparatus works; there is not high due to voltage spikes; the voltage sampling signal that sample circuit obtains is given decision circuitry; decision circuitry is thought does not need to open the electric-controlled switch element; the electric-controlled switch element is in the state of open circuit, so is equivalent to not add the absorption protection component in the circuit.And when peak voltage appearred in circuit port, the sampled voltage that sampling unit is delivered to judging unit had reacted the arrival of spike, and judging unit is thought needs starting protection, sends control signal to electric-controlled switch.After the electric-controlled switch closure, circuit port is equivalent to access absorption protection component unit, based on the effect that absorbs protection component, with the energy absorption of spike, and will restrain the voltage at port two ends.And then play the effect of protection.
With reference to shown in Figure 2, in the situation of not considering to isolate, sampling unit uses resistance R 2, the sampling of R3 dividing potential drop.Judging unit usage comparison device compares judgement.Electric-controlled switch is S1, controls its switch by the signal that comparator sends.Absorb protection component unit C and be comprised of capacitor C1 and resistor R1, the voltage linear ground at R3 two ends has reacted the voltage between AB, and this signal is delivered to comparator U1.The other input termination reference voltage Vref of comparator U1, when R2, R3 one timing, the size of Vref has determined peak voltage value corresponding to starting protection absorptive unit C.
With reference to shown in Figure 3, this moment, electric-controlled switch S1 open circuit protected absorber element unit C to be bypassed, and absorbed the normal operation of not impact of protection component equipment.
With reference to shown in Figure 4, after peak voltage occurred, when comparator was judged the magnitude of voltage that samples greater than given reference voltage Vref signal, S1 was open-minded for comparator output signal control electric-controlled switch, will protect absorber element unit C to be linked into the AB two ends.After absorbing the protection component unit and being linked into the AB two ends, peak voltage is to capacitor C 1 charging, and the energy of peak voltage namely is absorbed, and voltage is suppressed live also.
With reference to shown in Figure 5, absorb the protection component unit and cut out the AB two ends, circuit recovers normal operation, and the energy on the capacitor C1 is by resistor R1 bleed off simultaneously.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (2)
1. the overvoltage that can accurately preset the protection value absorbs protective circuit; it is characterized in that: by protection absorber element unit (C); reference voltage (vref); comparator (U1); electric-controlled switch (S1); electric capacity (C1) and three resistance (R1; R2; R3) form; the A of described protection absorber element unit (C) end and described the second resistance (R2) be connected the first resistance (R1) and be connected; described the second resistance (R2) and described the 3rd resistance (R3) be connected comparator (U1) and be connected; described the 3rd resistance (R3) is connected with the B end of described protection absorber element unit (C); described comparator (U1) end is connected with described reference voltage (vref); described reference voltage (vref) is connected with the B end of described protection absorber element unit (C); described comparator (U1) other end is connected with described electric-controlled switch (S1); described the first resistance (R1) is parallel with described electric capacity (C1); described the first resistance (R1) is connected with described electric-controlled switch (S1), and described electric-controlled switch (S1) is connected with the B end of described protection absorber element unit (C).
2. a kind of overvoltage that can accurately preset the protection value according to claim 1 absorbs protective circuit, and it is characterized in that: described electric-controlled switch (S1) is comprised of semiconductor switch device or relay element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220260345 CN202696138U (en) | 2012-06-05 | 2012-06-05 | Excess voltage absorption protection circuit capable of accurately presetting protection value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220260345 CN202696138U (en) | 2012-06-05 | 2012-06-05 | Excess voltage absorption protection circuit capable of accurately presetting protection value |
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| Publication Number | Publication Date |
|---|---|
| CN202696138U true CN202696138U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220260345 Expired - Fee Related CN202696138U (en) | 2012-06-05 | 2012-06-05 | Excess voltage absorption protection circuit capable of accurately presetting protection value |
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| CN (1) | CN202696138U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326344A (en) * | 2013-07-03 | 2013-09-25 | 华北电力大学 | Overvoltage limiting circuit |
| CN103457253A (en) * | 2012-06-05 | 2013-12-18 | 江苏固德威电源科技有限公司 | Over-voltage absorbing protective circuit capable of accurately presetting protection value |
-
2012
- 2012-06-05 CN CN 201220260345 patent/CN202696138U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457253A (en) * | 2012-06-05 | 2013-12-18 | 江苏固德威电源科技有限公司 | Over-voltage absorbing protective circuit capable of accurately presetting protection value |
| CN103326344A (en) * | 2013-07-03 | 2013-09-25 | 华北电力大学 | Overvoltage limiting circuit |
| CN103326344B (en) * | 2013-07-03 | 2015-10-28 | 华北电力大学 | A kind of overvoltage limiting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20140605 |