CN212412757U - Electric potential absorption circuit - Google Patents
Electric potential absorption circuit Download PDFInfo
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- CN212412757U CN212412757U CN202021271575.4U CN202021271575U CN212412757U CN 212412757 U CN212412757 U CN 212412757U CN 202021271575 U CN202021271575 U CN 202021271575U CN 212412757 U CN212412757 U CN 212412757U
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- voltage
- mos tube
- resistor
- capacitor
- electromotive force
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Abstract
The utility model provides a potential absorption circuit, which is used for absorbing the reverse electromotive force generated when a relay is closed, and comprises a voltage-stabilizing transmission circuit which is connected with the relay in series and is used for outputting the reverse electromotive force generated when the relay is closed; the source S of the MOS tube is connected with the output end of the voltage-stabilizing transmission circuit; and the anode of the rechargeable battery is connected with the drain D of the MOS tube, and the cathode of the rechargeable battery is connected with the grid G of the MOS tube. When the relay is closed, the generated back electromotive force is output to the source S of the MOS tube through the voltage-stabilizing transmission circuit, and because the back electromotive force is greater than the output voltage of the battery, the voltage of the source S of the MOS tube is greater than the voltage of the drain D of the MOS tube, the source S of the MOS tube is conducted to the drain D, so that the rechargeable battery is charged by utilizing the voltage difference between the back electromotive force and the output voltage of the battery, and the generated back electromotive force is absorbed.
Description
Technical Field
The utility model relates to an electric automobile circuit technical field, in particular to electric potential absorption circuit.
Background
With the rapid development of the new energy automobile industry, the production technology of new energy electric automobiles is mature day by day, and pure electric automobiles are gradually popularized in the lives of people.
The existing pure electric automobile is provided with an inductive load inside an automobile body for consuming reactive power in a circuit. A relay is arranged in the inductive load, and when the inductive load is closed, the reverse electromotive force stored in a coil of the relay is released.
The existing electric automobile is provided with a circuit with inductive load, and the reverse electromotive force stored in a relay coil cannot be effectively released, and the reverse electromotive force can bring certain damage to other components on the circuit, so that the circuit fails.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims at providing a potential absorption circuit to solve prior art's circuit and can not effectual absorption back electromotive force, lead to bringing certain damage for other components and parts on the circuit, make the problem of circuit inefficacy.
A potential absorbing circuit for absorbing a reverse electromotive force generated when a relay is turned off, comprising:
the voltage-stabilizing transmission circuit is connected with the relay in series and is used for outputting the back electromotive force generated when the relay is closed;
the source S of the MOS tube is connected with the output end of the voltage-stabilizing transmission circuit;
and the anode of the rechargeable battery is connected with the drain D of the MOS tube, and the cathode of the rechargeable battery is connected with the grid G of the MOS tube.
The utility model has the advantages that: when the relay is closed, the generated back electromotive force is output to the source S of the MOS tube through the voltage-stabilizing transmission circuit, and because the back electromotive force is greater than the output voltage of the battery, the voltage of the source S of the MOS tube is greater than the voltage of the drain D of the MOS tube, the source S of the MOS tube is conducted to the drain D, so that the rechargeable battery is charged by utilizing the voltage difference between the back electromotive force and the output voltage of the battery, and the generated back electromotive force is absorbed. The potential absorption circuit can fully absorb the back electromotive force generated when the relay is closed, and the energy utilization rate of the potential absorption circuit is improved.
Preferably, the voltage stabilizing transmission circuit includes a freewheeling diode D3 and a common mode inductor LF, the anode of the freewheeling diode D3 is connected in series with the relay, the cathode of the freewheeling diode D3 is connected in series with the input end of the common mode inductor LF, and the output end of the common mode inductor LF is connected with the source electrode S of the MOS transistor.
Preferably, the regulated voltage transmission circuit further comprises a regulated diode D1, a cathode of the regulated diode D1 is connected to the source S of the MOS transistor, and an anode of the regulated diode D1 is connected to the gate G of the MOS transistor.
Preferably, the regulated voltage transmission circuit further comprises a transient diode D2 for protecting the circuit from high voltage, and the regulated diode D1 is connected in parallel with the transient diode D2.
Preferably, a first resistor R1, a second resistor R2 and a third resistor R3 for providing bias voltage required for conducting the MOS transistor are connected between the source S and the gate G of the MOS transistor, and the third resistor R3 is connected in series with the zener diode D1.
Preferably, the first resistor R1 is connected in parallel with the third resistor R3, and the third resistor R3 is connected in parallel with the second resistor R2.
Preferably, a filter circuit for filtering power supply ripples is connected between the drain D and the gate G of the MOS transistor.
Preferably, the filter circuit includes a first capacitor C1 and a third capacitor C3 connected in series, and a second capacitor C2 having one end connected between the first capacitor C1 and the third capacitor C3, and the other end of the second capacitor C2 is grounded.
Preferably, the first capacitor C1 is connected to the positive electrode of the rechargeable battery, and the third capacitor C3 is connected to the negative electrode of the rechargeable battery.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of an embodiment of a potential absorption circuit according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a potential absorbing circuit according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of the connection between the voltage-stabilizing transmission circuit and the MOS transistor according to the first embodiment of the present invention.
Description of the main element symbols:
| relay with a |
10 | Voltage-stabilizing |
20 |
| |
30 | |
40 |
| |
50 |
The following detailed description of the invention will be further described in conjunction with the above-identified drawings.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a potential absorption circuit according to a first embodiment of the present invention is shown, including: relay 10, voltage-stabilizing transmission circuit 20, MOS tube 30 and charging battery 40.
Wherein: the potential absorbing circuit is used for absorbing the back electromotive force generated when the relay 10 is closed, and comprises:
a voltage-stabilizing transmission circuit 20 connected in series with the relay 10 for outputting a reverse electromotive force generated when the relay 10 is turned off;
the source S of the MOS tube 30 is connected with the output end of the voltage-stabilizing transmission circuit 20;
the positive electrode of the rechargeable battery 40 is connected to the drain D of the MOS transistor 30, and the negative electrode of the rechargeable battery 40 is connected to the gate G of the MOS transistor 30.
In the present embodiment, as shown in fig. 2, it should be noted that the voltage regulation transmission circuit 20 includes a freewheeling diode D3 and a common-mode inductor LF, wherein an anode of the freewheeling diode D3 is connected in series with the relay 10, a cathode of the freewheeling diode D3 is connected in series with an input terminal of the common-mode inductor LF, and an output terminal of the common-mode inductor LF is connected to the source S of the MOS transistor 30. In the present embodiment, as will be understood by those skilled in the art, when the relay 10 is turned off, the back electromotive force stored in the coil is released, the back electromotive force will generate a reverse voltage to the components in the circuit, and the freewheeling diode D3 connected in series between the relay 10 and the common film inductor LF may consume a part of the reverse voltage by doing work to protect the safety of other components in the circuit. It should be noted that the common-film inductor LF disposed in the voltage-stabilizing transmission circuit 20 is used for filtering the electromagnetic interference signal generated in the voltage-stabilizing transmission circuit 20, so as to ensure the stability of the transmission of the back electromotive force and improve the working efficiency. It should be noted that, when the current in the voltage-stabilizing transmission circuit 20 flows through the common film inductor LF, the current generates reverse magnetic fields in the inductance coils wound in the same phase to cancel each other out, and at this time, the normal signal current is mainly affected by the coil resistance.
In the present embodiment, in order to express the connection relationship between the regulator transmitting circuit 20 and the MOS transistor 30 more clearly, as shown in fig. 3, the regulator transmitting circuit 20 further includes a regulator diode D1, a cathode of the regulator diode D1 is connected to the source S of the MOS transistor 30, and an anode of the regulator diode D1 is connected to the gate G of the MOS transistor 30. When the input back electromotive force is too high, the zener diode D1 can regulate the voltage, and the zener diode D1 can make the voltage across the gate G and the source S of the MOS transistor 30 always not exceed the withstand voltage of the MOS transistor 30, thereby protecting the MOS transistor 30 from being damaged by the too high voltage. As shown in fig. 3, it is apparent that the regulator transmitting circuit 20 further includes a transient diode D2 for protecting the circuit from high voltage, and the zener diode D1 is connected in parallel with the transient diode D2. The transient diode D2 can reduce the voltage and protect the regulated transmission circuit 20 from high voltage.
In the present embodiment, as shown in fig. 3, a first resistor R1, a second resistor R2 and a third resistor R3 for providing a bias voltage required for turning on the MOS transistor 30 are connected between the source S and the gate G of the MOS transistor 30, and the third resistor R3 is connected in series with the zener diode D1. It is obvious that the first resistor R1 is connected in parallel with the third resistor R3, and the third resistor R3 is connected in parallel with the second resistor R2. As will be understood by those skilled in the art, when the back electromotive force in the zener transmission circuit 20 is high, the zener diode D1 is turned on in the reverse direction, and the on-resistance of the zener diode D1 changes with the change of the back electromotive force, and the voltage across the first resistor R1 can be synchronously changed while the change occurs, so as to ensure that the voltage between the gate G and the source S of the MOS transistor 30 is always within a safe voltage range.
In the present embodiment, a filter circuit 50 for filtering power supply ripples is further connected between the drain D and the gate G of the MOS transistor 30. The filter circuit 50 includes a first capacitor C1 and a third capacitor C3 connected in series, and a second capacitor C2 connected between the first capacitor C1 and the third capacitor C3 at one end, and the other end of the second capacitor C2 is grounded. The first capacitor C1 is connected to the positive electrode of the rechargeable battery 40, and the third capacitor C3 is connected to the negative electrode of the rechargeable battery 40. Through the connection and combination among a plurality of capacitors, the power supply ripple generated by the positive and negative poles of the rechargeable battery 40 can be effectively filtered.
In specific implementation, when the relay 10 is turned off, the generated back electromotive force is output to the source S of the MOS transistor 30 through the voltage stabilizing transmission circuit 20, and since the back electromotive force is greater than the output voltage of the rechargeable battery 40 at this time, the source S voltage of the MOS transistor 30 is greater than the drain D voltage thereof, so that the source S of the MOS transistor 30 is conducted to the drain D to charge the rechargeable battery 40 by using the voltage difference between the back electromotive force and the output voltage of the rechargeable battery 40, so as to absorb the generated back electromotive force. The potential absorption circuit can sufficiently absorb the back electromotive force generated when the relay 10 is closed, and the energy utilization rate of the potential absorption circuit is improved.
It should be noted that the above implementation procedure is only for illustrating the applicability of the present application, but this does not represent that the potential absorption circuit of the present application has only the above-mentioned unique implementation flow, and on the contrary, the potential absorption circuit of the present application can be incorporated into the feasible embodiments of the present application as long as the potential absorption circuit of the present application can be implemented.
To sum up, the utility model discloses electric potential absorption circuit among the above-mentioned embodiment, when relay 10 closed, produced back electromotive force exported source S to MOS pipe 30 through steady voltage transmission circuit 20, because back electromotive force is greater than rechargeable battery 40 'S output voltage this moment, MOS pipe 30' S source S voltage was greater than its drain D voltage this moment to MOS pipe 30 'S source S switches on to drain D, charge rechargeable battery 40 with the pressure differential that utilizes between back electromotive force and rechargeable battery 40' S output voltage, in order to absorb produced back electromotive force. The potential absorption circuit can sufficiently absorb the back electromotive force generated when the relay 10 is closed, and the energy utilization rate of the potential absorption circuit is improved.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A potential absorbing circuit for absorbing a reverse electromotive force generated when a relay is turned off, comprising:
the voltage-stabilizing transmission circuit is connected with the relay in series and is used for outputting the back electromotive force generated when the relay is closed;
the source S of the MOS tube is connected with the output end of the voltage-stabilizing transmission circuit;
and the anode of the rechargeable battery is connected with the drain D of the MOS tube, and the cathode of the rechargeable battery is connected with the grid G of the MOS tube.
2. The potential absorbing circuit according to claim 1, wherein: the voltage-stabilizing transmission circuit comprises a freewheeling diode D3 and a common-mode inductor LF, the anode of the freewheeling diode D3 is connected with the relay in series, the cathode of the freewheeling diode D3 is connected with the input end of the common-mode inductor LF in series, and the output end of the common-mode inductor LF is connected with the source electrode S of the MOS tube.
3. The potential absorbing circuit according to claim 2, wherein: the voltage stabilizing transmission circuit further comprises a voltage stabilizing diode D1, the cathode of the voltage stabilizing diode D1 is connected with the source S of the MOS tube, and the anode of the voltage stabilizing diode D1 is connected with the grid G of the MOS tube.
4. The potential absorbing circuit according to claim 3, wherein: the voltage stabilizing transmission circuit also comprises a transient diode D2 for protecting the circuit from high voltage, and the voltage stabilizing diode D1 is connected with the transient diode D2 in parallel.
5. The potential absorbing circuit according to claim 4, wherein: a first resistor R1, a second resistor R2 and a third resistor R3 which are used for providing bias voltage required by conduction for the MOS transistor are connected between the source S and the gate G of the MOS transistor, and the third resistor R3 is connected with the voltage-stabilizing diode D1 in series.
6. The potential absorbing circuit according to claim 5, wherein: the first resistor R1 is connected in parallel with the third resistor R3, and the third resistor R3 is connected in parallel with the second resistor R2.
7. The potential absorbing circuit according to claim 1, wherein: and a filter circuit for filtering power supply ripples is connected between the drain electrode D and the grid electrode G of the MOS tube.
8. The potential absorbing circuit according to claim 7, wherein: the filter circuit comprises a first capacitor C1 and a third capacitor C3 which are connected in series, and a second capacitor C2 of which one end is connected between the first capacitor C1 and the third capacitor C3, and the other end of the second capacitor C2 is grounded.
9. The potential absorbing circuit according to claim 8, wherein: the first capacitor C1 is connected with the anode of the rechargeable battery, and the third capacitor C3 is connected with the cathode of the rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021271575.4U CN212412757U (en) | 2020-07-02 | 2020-07-02 | Electric potential absorption circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021271575.4U CN212412757U (en) | 2020-07-02 | 2020-07-02 | Electric potential absorption circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212412757U true CN212412757U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021271575.4U Expired - Fee Related CN212412757U (en) | 2020-07-02 | 2020-07-02 | Electric potential absorption circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212412757U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114180094A (en) * | 2021-12-08 | 2022-03-15 | 中国兵器装备集团自动化研究所有限公司 | Power management device and method for tethered multi-rotor unmanned aerial vehicle |
| CN115065140A (en) * | 2022-08-19 | 2022-09-16 | 深圳市宝润科技有限公司 | Motor energy recovery circuit, charge-discharge module and electric equipment |
-
2020
- 2020-07-02 CN CN202021271575.4U patent/CN212412757U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114180094A (en) * | 2021-12-08 | 2022-03-15 | 中国兵器装备集团自动化研究所有限公司 | Power management device and method for tethered multi-rotor unmanned aerial vehicle |
| CN114180094B (en) * | 2021-12-08 | 2024-02-09 | 中国兵器装备集团自动化研究所有限公司 | Tethered multi-rotor unmanned aerial vehicle power management device and method |
| CN115065140A (en) * | 2022-08-19 | 2022-09-16 | 深圳市宝润科技有限公司 | Motor energy recovery circuit, charge-discharge module and electric equipment |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210126 |