CN215071638U - Anti-sparking and reverse connection circuit of DC power output end - Google Patents
Anti-sparking and reverse connection circuit of DC power output end Download PDFInfo
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- CN215071638U CN215071638U CN202121235549.0U CN202121235549U CN215071638U CN 215071638 U CN215071638 U CN 215071638U CN 202121235549 U CN202121235549 U CN 202121235549U CN 215071638 U CN215071638 U CN 215071638U
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Abstract
The embodiment of the utility model discloses DC power output end prevent striking sparks and reverse connection circuit, including the relay, triode Q1, triode Q2, diode D2, diode D3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, comparison amplifier, stabilivolt, wherein, the anodal and DC power output end positive pole of DC power input end are connected to the contact of relay, the e of triode Q1 is extremely through the one end of resistance R5 connection relay's coil; the positive input end of the comparison amplifier is connected with the e pole of the triode Q1 through a resistor R3 and a resistor R4 which are connected in series, and the negative input end of the comparison amplifier is connected with the e pole of the triode Q1 through a resistor R7; the output end of the comparison amplifier is connected with the b pole of a triode Q2 through a resistor R6; the e pole of the triode Q2 is grounded, and the c pole is connected with the other end of the coil of the relay. The utility model discloses can prevent that DC power and DC input equipment from striking sparks in the switch-on in the twinkling of an eye, can prevent the transposition simultaneously.
Description
Technical Field
The utility model relates to a DC power technical field especially relates to a DC power output's prevent striking sparks and reverse connection circuit.
Background
With the popularization of more and more DC input devices in family life, the DC power supply is generally directly connected with the DC devices through connecting terminals, and at the moment of connecting the DC power supply with the DC input devices, because the capacitor on the input devices or the input devices are batteries directly (the voltage on the capacitor cannot be suddenly changed), the ignition phenomenon can occur at the moment of connecting, electric sparks are generated, and sounds are generated when the ignition occurs, the fire risk is caused under severe conditions, discomfort is caused to users when the ignition occurs, the use experience is poor, and the like. In some applications where there are stringent requirements for open flames, for example: car chargers, etc.; or when the DC input device for daily household is charged, such as charging a battery of an electric vehicle, the ignition phenomenon may cause fire hazard.
When a malfunction occurs, the polarity of the DC power output is reversed when connected to the DC input device, possibly damaging the device.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides a DC power output's prevent striking sparks and reverse connection circuit to the realization prevents that DC power and DC input equipment put through from striking sparks in the twinkling of an eye, and prevents reverse connection.
In order to solve the above technical problem, an embodiment of the present invention provides an anti-spark and anti-reverse connection circuit for a DC power output terminal, including a relay, a transistor Q1, a transistor Q2, a diode D2, a diode D3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a comparison amplifier, and a voltage regulator, wherein,
the contact of the relay is connected with the positive electrode of the DC power supply input end and the positive electrode of the DC power supply output end, the positive electrode of the input end of the DC power supply is connected with the c electrode of a triode Q1 through a diode D2 and a resistor R2 which are connected in series, the e electrode of the triode Q1 is connected with one end of a coil of the relay through a resistor R5, the c electrode and the b electrode of a triode Q1 are connected through a resistor R1, and the b electrode of the triode Q1 is connected with the negative electrode of a voltage stabilizing tube; the anode of the voltage-stabilizing tube is connected with the negative input end of the comparison amplifier through a diode D3 and a resistor R8 which are connected in series; the positive input end of the comparison amplifier is connected with the e pole of the triode Q1 through a resistor R3 and a resistor R4 which are connected in series, and the negative input end of the comparison amplifier is connected with the e pole of the triode Q1 through a resistor R7; the diode D3 and the resistor R8 are grounded; the positive electrode and the negative electrode of a power supply end of the comparison amplifier are respectively connected with the e electrode of the triode Q1 and the ground, and the output end of the comparison amplifier is connected with the b electrode of the triode Q2 through a resistor R6; the e pole of the triode Q2 is grounded, and the c pole is connected with the other end of the coil of the relay.
Furthermore, the capacitor C1 and the capacitor C2 are further included, one end of the capacitor C1 and one end of the capacitor C2 are grounded, and the other end of the capacitor C1 and the other end of the capacitor C2 are connected with the cathode of the diode D2.
Furthermore, the circuit also comprises a capacitor C5, wherein one end of the capacitor C5 is grounded, and the other end of the capacitor C5 is connected with the anode of a power supply end of the comparison amplifier.
Furthermore, the capacitor C4 is also included, one end of the capacitor C4 is grounded, and the other end is connected between the resistor R3 and the resistor R4.
Further, the relay further comprises a diode D1 connected with the coil of the relay in parallel, and the anode of the diode D1 is connected with the c pole of the triode Q2.
Furthermore, the circuit also comprises a resistor R9, and two ends of the resistor R9 are respectively connected with the e pole and the b pole of the triode Q2.
The utility model has the advantages that: the utility model discloses can prevent that DC power and DC input equipment from striking sparks in the switch-on in the twinkling of an eye, can prevent the transposition simultaneously.
Drawings
Fig. 1 is a circuit diagram of an anti-sparking and reverse connection circuit of a DC power output terminal according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the circuit for preventing sparking and reverse connection of the DC power output terminal of the embodiment of the present invention includes a relay K1, a transistor Q1, a transistor Q2, a diode D2, a diode D3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a comparison amplifier U1, and a voltage regulator Z1.
The relay K1 is a normally open relay, and the contact of the relay K1 is connected with the positive pole of the DC power supply input end and the positive pole of the DC power supply output end. The positive electrode of the input end of the DC power supply is connected with the c electrode of the triode Q1 through a diode D2 and a resistor R2 which are connected in series. Resistor R2 is a current limiting resistor. The anode of the diode D2 is connected with the anode of the input end of the DC power supply. The e pole of the triode Q1 is connected with one end of the coil of the relay K1 through a resistor R5, the c pole and the b pole of the triode Q1 are connected through a resistor R1, and the b pole of the triode Q1 is connected with the negative pole of a voltage regulator tube Z1. The anode of the voltage regulator tube Z1 is connected with the negative input end of the comparison amplifier U1 through a diode D3 and a resistor R8 which are connected in series. The anode of the diode D3 is connected with the anode of the voltage regulator tube Z1. The diode D3 functions to protect the circuit from damage when reverse connected and to compensate for the series voltage regulation circuit.
The positive input end of the comparison amplifier U1 is connected with the e pole of the triode Q1 through a resistor R3 and a resistor R4 which are connected in series, and the negative input end of the comparison amplifier U1 is connected with the e pole of the triode Q1 through a resistor R7. The diode D3 and the resistor R8 are grounded. The anode and the cathode of a power supply end of the comparison amplifier U1 are respectively connected with the e pole of the triode Q1 and the ground. The output end of the comparison amplifier U1 is connected with the b pole of the triode Q2 through a resistor R6. The e pole of the triode Q2 is grounded, and the c pole is connected with the other end of the coil of the relay K1.
For example, the comparison amplifier can adopt LM321, the level signal of PIN3 PIN of LM321 is compared with the level signal of PIN1 PIN, when the level of PIN1 PIN is higher than that of PIN3 PIN, PIN4 PIN outputs high level; when the PIN1 PIN level is lower than the PIN3 PIN, the PIN4 PIN outputs a low level.
In one embodiment, the circuit for preventing sparking and reverse connection of the output end of the DC power supply further comprises a capacitor C1 and a capacitor C2, wherein one end of the capacitor C1 and one end of the capacitor C2 are grounded, and the other end of the capacitor C3526 and the other end of the capacitor C2 are connected to the cathode of the diode D2. The capacitors C1 and C2 function to filter out interfering signals at the moment of switching on.
In one embodiment, the anti-spark and anti-reverse circuit of the DC power output terminal further includes a capacitor C5, one end of the capacitor C5 is grounded, and the other end is connected to the positive electrode of the power terminal of the comparison amplifier U1. The capacitor C5 filters the interference signal for the comparison amplifier (LM 321).
In one embodiment, the anti-spark and anti-reverse circuit for the output terminal of the DC power supply further includes a capacitor C4, one end of the capacitor C4 is grounded, and the other end is connected between the resistor R3 and the resistor R4.
In one embodiment, the anti-spark and reverse-connection circuit of the DC power output terminal further includes a diode D1 connected in parallel with the coil of the relay K1, and the anode of the diode D1 is connected to the c pole of the transistor Q2.
In one embodiment, the circuit for preventing sparking and reverse connection of the DC power output terminal further includes a resistor R9, and two ends of the resistor R9 are respectively connected to the e pole and the b pole of the transistor Q2.
The utility model discloses a theory of operation does: as shown in fig. 1, when the DC power is switched on, Vin + is connected to the relay K1 all the way; the other path supplies power to and operates the functional circuit through D2. When the DC input is reversely connected, the D2 is reversely cut off, the power supply of the circuit is lost, so the K1 relay always keeps an open state, and the circuit is in a reverse connection prevention state at the moment. When the DC input is normally accessed, Vin + supplies power to a functional circuit through D2, a series voltage stabilizing circuit consisting of Q1, R1, Z1 and D3 is started firstly, and the circuit provides a VCC voltage of 12V stably; the voltage divider circuit composed of R7 and R8 is connected with the PIN3 PIN of LM321 (comparison amplifier), the other RC delay circuit composed of R4 and C4 is connected with the PIN1 PIN of LM321 (comparison amplifier) through R3. When the DC power supply is normally connected, the level of a PIN3 PIN of U1 is established faster than that of a PIN1 PIN, so that the PIN4 PIN of LM321 outputs low level firstly, and Q2 is in an off state at the moment; when VCC current charges C4 through R4, the level of point A is gradually increased, (the level of point A is equal to the level of PIN1 PIN of U1), when the level of PIN1 PIN is higher than the level of PIN3 PIN, the level output by PIN4 is inverted to high level, the high level supplies power to the base level of Q2 through R6, Q2 is saturated and conducted, and then relay K1 is closed. Finally, the DC power source completes the connection with the DC input device.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An anti-spark and anti-reverse connection circuit of a DC power output end is characterized by comprising a relay, a triode Q1, a triode Q2, a diode D2, a diode D3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a comparison amplifier and a voltage regulator tube, wherein,
the contact of the relay is connected with the positive electrode of the DC power supply input end and the positive electrode of the DC power supply output end, the positive electrode of the input end of the DC power supply is connected with the c electrode of a triode Q1 through a diode D2 and a resistor R2 which are connected in series, the e electrode of the triode Q1 is connected with one end of a coil of the relay through a resistor R5, the c electrode and the b electrode of a triode Q1 are connected through a resistor R1, and the b electrode of the triode Q1 is connected with the negative electrode of a voltage stabilizing tube; the anode of the voltage-stabilizing tube is connected with the negative input end of the comparison amplifier through a diode D3 and a resistor R8 which are connected in series; the positive input end of the comparison amplifier is connected with the e pole of the triode Q1 through a resistor R3 and a resistor R4 which are connected in series, and the negative input end of the comparison amplifier is connected with the e pole of the triode Q1 through a resistor R7; the diode D3 and the resistor R8 are grounded; the positive electrode and the negative electrode of a power supply end of the comparison amplifier are respectively connected with the e electrode of the triode Q1 and the ground, and the output end of the comparison amplifier is connected with the b electrode of the triode Q2 through a resistor R6; the e pole of the triode Q2 is grounded, and the c pole is connected with the other end of the coil of the relay.
2. The circuit of claim 1, further comprising a capacitor C1 and a capacitor C2, wherein one end of the capacitor C1 and the capacitor C2 is connected to ground, and the other end is connected to the negative terminal of a diode D2.
3. The circuit of claim 1, further comprising a capacitor C5, wherein one end of the capacitor C5 is connected to ground and the other end is connected to the positive terminal of the power supply terminal of the comparison amplifier.
4. The circuit of claim 1, further comprising a capacitor C4, wherein one end of the capacitor C4 is grounded, and the other end is connected between the resistor R3 and the resistor R4.
5. The anti-sparking and reverse-connection circuit for DC power output terminals as set forth in claim 1, further comprising a diode D1 connected in parallel with the coil of the relay, the anode of the diode D1 being connected to the c-pole of the transistor Q2.
6. The circuit of claim 1, further comprising a resistor R9, wherein the resistor R9 is connected to the e-pole and the b-pole of the transistor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121235549.0U CN215071638U (en) | 2021-06-03 | 2021-06-03 | Anti-sparking and reverse connection circuit of DC power output end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121235549.0U CN215071638U (en) | 2021-06-03 | 2021-06-03 | Anti-sparking and reverse connection circuit of DC power output end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215071638U true CN215071638U (en) | 2021-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121235549.0U Active CN215071638U (en) | 2021-06-03 | 2021-06-03 | Anti-sparking and reverse connection circuit of DC power output end |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215071638U (en) |
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2021
- 2021-06-03 CN CN202121235549.0U patent/CN215071638U/en active Active
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