CN216672838U - Input reverse connection circuit and device - Google Patents
Input reverse connection circuit and device Download PDFInfo
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- CN216672838U CN216672838U CN202123003530.6U CN202123003530U CN216672838U CN 216672838 U CN216672838 U CN 216672838U CN 202123003530 U CN202123003530 U CN 202123003530U CN 216672838 U CN216672838 U CN 216672838U
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Abstract
The utility model discloses an input reverse connection circuit and a device, which are used for providing a non-polarized input port for a load, and comprise: the control system comprises a first switch unit, a second switch unit, a first control unit connected with the first switch unit and the second switch unit, and a second control unit connected with the first control unit; the first control unit controls the conduction of each channel in the first switch unit and the second switch unit based on the polarity of power access, so that the power supply can normally supply power even if the power supply is in non-polarity distinguishing connection, and the second control unit realizes the normal power supply without power consumption through the working state of the first control unit.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to an input reverse-connection circuit and an input reverse-connection device.
Background
In the prior art, although the reverse connection prevention circuit can effectively protect the rear-stage circuit, the power cannot be normally supplied to the rear-stage circuit after the polarity is reversed, so that the power cannot be normally supplied if the polarity is not corrected, and time and labor are wasted after the circuit is reworked.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a circuit and a device for input reverse connection, which overcome at least one of the disadvantages of the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing an input reversible circuit for providing a non-polarized input port to a load, comprising:
the first switch unit comprises a first channel for providing a conducting loop for the negative pole of the load when the power supply polarity is connected correctly and a second channel for providing a conducting loop for the positive pole of the load when the power supply polarity is connected reversely;
the second switch unit comprises a third channel for providing a conducting loop for the anode of the load when the polarity of the power supply is connected correctly, and a fourth channel for providing a conducting loop for the cathode of the load when the polarity of the power supply is connected reversely;
the first control unit is connected with the first switch unit and the second switch unit and controls the conduction of each channel in the first switch unit and the second switch unit based on the access polarity of a power supply;
and the second control unit is connected with the first control unit and used for controlling the working state of the first control unit.
Preferably, in the input reversible circuit of the present invention, the first switch unit is a first relay K1, and the second switch unit is a second relay K2;
the first channel consists of an input end and a normally closed end of the first relay K1, the second channel consists of an input end and a normally open end of the first relay K1, the third channel consists of an input end and a normally closed end of the second relay K2, and the fourth channel consists of an input end and a normally open end of the second relay K2;
the input end of the first relay K1 is connected with the power supply input end of the first control unit, the grounding end of the first control unit is connected with the input end of the second relay K2 through the second control unit, and the first control unit is connected with the power supply ends of the first relay K1 and the second relay K2.
Preferably, in the input reversible circuit of the present invention, the first control unit includes a second diode D2 for preventing the first relay K1 from being excited when the power supply polarity is connected correctly, and a third diode D3 for preventing the second relay K2 from being excited when the power supply polarity is connected correctly;
the anode of the second diode D2 is connected to the second power supply terminal of the first relay K1, the anode of the third diode D3 is connected to the second power supply terminal of the second relay K2, and the cathode of the second diode D2 and the cathode of the second triode D3 are connected to the input terminal of the second relay K2.
Preferably, in the input reversible circuit of the present invention, the second control unit is a first diode D1; the grounding end of the first control unit is connected with the anode of the first diode D1, and the anode of the first diode D1 is connected with the input end of the second relay K2.
Preferably, in the input reversible circuit of the present invention, the first control unit includes a first resistor R1, a third resistor R3, a fourth resistor R4 of the reference voltage source chip U1, and a fifth resistor R5;
the first end of the first resistor R1 is the power input end of the first control unit, the second end of the first resistor R1 is connected to the cathode of the reference voltage source chip U1, the anode of the reference voltage source chip U1 is the ground end of the first control unit and is connected to the anode of the first diode D1, the cathode of the reference voltage source chip U1 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the first power supply ends of the first relay K1 and the second relay K2, the fourth resistor R4 is connected in parallel between the cathode of the reference voltage source chip U1 and the reference voltage input end, and the fifth resistor R5 is connected in parallel between the reference voltage input end of the reference voltage source chip U1 and the anode.
Preferably, in the input reversible circuit of the present invention, the first control unit further includes a second resistor R2, a sixth resistor R6, and a seventh resistor R7;
the first resistor R1 is connected to the cathode of the reference voltage source chip U1 through the second resistor R2, the sixth resistor R6 is connected in parallel to two ends of the first resistor R1, and the seventh resistor R7 is connected in parallel to two ends of the second resistor R2.
Preferably, in the input-reversible circuit of the present invention, the reference voltage source chip U1 is TL 431.
Preferably, in the input reversible circuit, the first control unit includes a first resistor R1, a third resistor R3, and a fourth regulator DZ 4;
the first end of the first resistor R1 is a power input end of the first control unit, the second end of the first resistor R1 is connected to the cathode of the fourth voltage regulator DZ4, the cathode of the fourth voltage regulator DZ4 is connected to the first power supply ends of the first relay K1 and the first relay K1 through the third resistor R3, and the anode of the fourth voltage regulator DZ4 is the ground end of the first control unit and is connected to the anode of the first diode D1.
Preferably, in the input reversible circuit of the present invention, the first control unit further includes a second resistor R2, a sixth resistor R6, and a seventh resistor R7;
the first resistor R1 is connected to the cathode of the fourth voltage regulator tube DZ4 through the second resistor R2, the sixth resistor R6 is connected in parallel to two ends of the first resistor R1, and the seventh resistor R7 is connected in parallel to two ends of the second resistor R2.
The utility model also constructs an input reversible device which comprises the input reversible circuit.
The implementation of the utility model has at least the following beneficial effects: the first control unit controls the conduction of each channel in the first switch unit and the second switch unit based on the polarity of power access, so that the power supply can normally supply power even if the power supply is in non-polarity distinguishing connection, and the second control unit realizes the normal power supply without power consumption through the working state of the first control unit.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a circuit diagram of a first embodiment of an input switchably connected circuit in the present invention;
FIG. 2 is a circuit diagram of a second embodiment of an input reversible circuit in accordance with the present invention;
FIG. 3 is a circuit diagram of a third embodiment of an input switchably connected circuit in the present invention;
fig. 4 is a circuit diagram of a fourth embodiment of the input switchably connecting circuit in the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, which is a circuit diagram of a first embodiment of the input reversible circuit in the present invention, the input reversible circuit includes:
a first switching unit 300 including a first channel providing a conduction loop for a negative pole of the load when the polarity of the power is correctly connected, and a second channel providing a conduction loop for a positive pole of the load when the polarity of the power is reversed;
a second switching unit 400 including a third channel providing a conduction loop for the positive electrode of the load when the power polarity is correctly connected, and a fourth channel providing a conduction loop for the negative electrode of the load when the power polarity is reversely connected;
a first control unit 100 connected to the first switch unit 300 and the second switch unit 400, for controlling the conduction of each channel in the first switch unit 300 and the second switch unit 400 based on the access polarity of the power supply;
the second control unit 200 is connected to the first control unit 100, and is configured to control an operating state of the first control unit 100.
As shown in fig. 1, the first switching unit 300 is a first relay K1, and the second switching unit 400 is a second relay K2; the first and second pins in the first relay K1 are power supply terminals of the first relay K1, the first and second pins correspond to the first power supply terminal and the second power supply terminal, and the third, fourth and fifth pins are an input terminal, a normally closed terminal and a normally open terminal, respectively, of the first relay K1, and the pin definition of the second relay K2 is the same as that of the first relay K1.
Specifically, the first channel is composed of the input end and the normally closed end of the first relay K1, the second channel is composed of the input end and the normally open end of the first relay K1, the third channel is composed of the input end and the normally closed end of the second relay K2, and the fourth channel is composed of the input end and the normally open end of the second relay K2; the input end of the first relay K1 is connected to the power input end of the first control unit 100, the ground end of the first control unit 100 is connected to the input end of the second relay K2 through the second control unit 200, and the first control unit 100 is connected to the power supply ends of the first relay K1 and the second relay K2.
The first control unit 100 as in fig. 1 includes a first resistor R1, a third resistor R3, a reference voltage source chip U1, a fourth resistor R4, a fifth resistor R5, a second diode D2 for preventing the first relay K1 from being excited when the power polarity is connected correctly, and a third diode D3 for preventing the second relay K2 from being excited when the power polarity is connected correctly, wherein the reference voltage source chip U1 may be TL 431;
specifically, a first end of the first resistor R1 is a power input end of the first control unit 100, a second end of the first resistor R1 is connected to a cathode of the reference voltage source chip U1, an anode of the reference voltage source chip U1 is a ground end of the first control unit 100 and is connected to an anode of the first diode D1, a cathode of the reference voltage source chip U1 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to first power supply ends of the first relay K1 and the second relay K2, the fourth resistor R4 is connected in parallel between the cathode and the reference voltage input end of the reference voltage source chip U1, the fifth resistor R5 is connected in parallel between the reference voltage input end and the anode of the reference voltage source chip U1, an anode of the second diode D5 is connected to a second power supply end of the first relay K1, an anode of the third diode D3 is connected to a second power supply end of the second relay K2, and a cathode of the second diode D2 is connected to a cathode of the second relay 82 2 6.
Alternatively, the second control unit 200 may be a first diode D1; the first control unit 100 is connected to the anode of a first diode D1, and the anode of the first diode D1 is connected to the input terminal of a second relay K2.
The principle of the circuit diagram shown in fig. 1 is explained below: the first power supply end and the second power supply end of each of the first relay K1 and the second relay K2 are power supply ports of the corresponding excitation coil; when the upper input port in fig. 1 is connected to the positive electrode of the power supply, and the lower input port is connected to the negative electrode of the power supply, that is, when the positive and negative polarities of the power supply are reversed, the input voltage is divided by the first resistor R1 and then input to the first power supply terminals of the first relay K1 and the second relay K2, at this time, the second diode D2 and the third diode D3 are turned on, so that the excitation coils in the first relay K1 and the second relay K2 are turned on, the normally open circuits of the first relay K1 and the second relay K2 are closed, and the current of the power supply is connected to the input terminal of the second relay K2 through the input terminal of the first relay K1, the normally open terminal of the first relay K1, the load, and the normally open terminal of the second relay K2, thereby realizing the function of outputting the reversed connection; the reference voltage source chip U1, the fourth resistor R4 and the fifth resistor R5 form a voltage stabilizing circuit, so that the voltage of the command signals input to the first relay K1 and the second relay K2 is stabilized within the rated working voltage range of the first relay K1 and the second relay K2, and the excitation coils of the first relay K1 and the second relay K2 are prevented from being undervoltage or overvoltage damaged;
when the polarity of the power supply is connected correctly, the voltage values of the cathodes of the second diode D2 and the third diode D3 are the input voltage value of the power supply, the second diode D2 and the third diode D3 are cut off, so that the excitation coils in the first relay K1 and the second relay K2 are not conducted, the current of the power supply is connected to the input end of the first relay K1 through the input end of the second relay K2, the normally closed end of the second relay K2, the load and the normally closed end of the first relay K1, and therefore the power supply can be normally supplied when the polarity of the power supply is connected correctly; at this time, since the excitation coils in the first relay K1 and the second relay K2 are not conducted to normally supply power to the load, the control unit 100 may suspend operation, and in this embodiment, the control unit 100 is not conducted by the cut-off function of the first diode D1, so that the normal power supply without power consumption is realized when the polarity of the power is correctly switched on.
Fig. 2 is a circuit diagram of a second embodiment of the input reversible circuit of the present invention. The second embodiment differs from the first embodiment mainly in that: the first control unit 100 further includes a second resistor R2, a sixth resistor R6, and a seventh resistor R7; the first resistor R1 is connected to the cathode of the reference voltage source chip U1 through the second resistor R2, the sixth resistor R6 is connected in parallel to two ends of the first resistor R1, and the seventh resistor R7 is connected in parallel to two ends of the second resistor R2. The second resistor R2, the sixth resistor R6 and the seventh resistor R7 are additionally arranged to divide and shunt the voltage of the first resistor R1, so that the first resistor R1 is prevented from being damaged due to too large input voltage of a power supply, and the flexibility of debugging the circuit is improved.
Fig. 3 is a circuit diagram of a third embodiment of the input reversible circuit of the present invention. The main differences between the third embodiment and the second embodiment are: the constituent components of the control unit 100, the first control unit 100 in the third embodiment includes a first resistor R1, a third resistor R3, a fourth regulator DZ4, a second diode D2, and a third diode D3; a first end of the first resistor R1 is a power input end of the first control unit 100, a second end of the first resistor R1 is connected to a cathode of the fourth regulator DZ4, a cathode of the fourth regulator DZ4 is connected to a first power supply end of the first relay K1 and the first power supply end of the first relay K1 through the third resistor R3, an anode of the fourth regulator DZ4 is a ground end of the first control unit 100 and is connected to an anode of the first diode D1, an anode of the second diode D2 is connected to a second power supply end of the first relay K1, an anode of the third diode D3 is connected to a second power supply end of the second relay K2, and a cathode of the second diode D2 and a cathode of the second triode D3 are connected to an input end of the second relay K2.
The principle of the circuit diagram shown in fig. 3 is explained below: the first power supply end and the second power supply end of each of the first relay K1 and the second relay K2 are power supply ports of the corresponding excitation coil; when the upper input port in fig. 1 is connected to the positive electrode of the power supply, and the lower input port is connected to the negative electrode of the power supply, that is, when the positive and negative polarities of the power supply are reversed, the input voltage is divided by the first resistor R1 and then input to the first power supply terminals of the first relay K1 and the second relay K2, at this time, the second diode D2 and the third diode D3 are turned on, so that the excitation coils in the first relay K1 and the second relay K2 are turned on, the normally open circuits of the first relay K1 and the second relay K2 are closed, and the current of the power supply is connected to the input terminal of the second relay K2 through the input terminal of the first relay K1, the normally open terminal of the first relay K1, the load, and the normally open terminal of the second relay K2, thereby realizing the function of outputting the reversed connection; the fourth voltage regulator tube DZ4 is used for stabilizing the voltage of the command signals input to the first relay K1 and the second relay K2 within the rated working voltage range of the first relay K1 and the second relay K2 so as to prevent the excitation coils of the first relay K1 and the second relay K2 from being undervoltage or overvoltage damaged;
when the polarity of the power supply is connected correctly, the voltage values of the cathodes of the second diode D2 and the third diode D3 are the input voltage value of the power supply, the second diode D2 and the third diode D3 are cut off, so that the excitation coils in the first relay K1 and the second relay K2 are not conducted, the current of the power supply is connected to the input end of the first relay K1 through the input end of the second relay K2, the normally closed end of the second relay K2, the load and the normally closed end of the first relay K1, and therefore the power supply can be normally supplied when the polarity of the power supply is connected correctly; at this time, since the excitation coils in the first relay K1 and the second relay K2 are not conducted to normally supply power to the load, the control unit 100 may suspend operation, and in this embodiment, the control unit 100 is not conducted by the cut-off function of the first diode D1, so that the normal power supply without power consumption is realized when the polarity of the power is correctly switched on.
Fig. 4 is a circuit diagram of a fourth embodiment of the input reversible circuit of the present invention. The main differences between the third embodiment and the fourth embodiment are: the first control unit 100 further includes a second resistor R2, a sixth resistor R6, and a seventh resistor R7; the first resistor R1 is connected to the cathode of the fourth voltage regulator tube DZ4 through the second resistor R2, the sixth resistor R6 is connected in parallel with the two ends of the first resistor R1, and the seventh resistor R7 is connected in parallel with the two ends of the second resistor R2. The second resistor R2, the sixth resistor R6 and the seventh resistor R7 are additionally arranged to divide and shunt the voltage of the first resistor R1, so that the first resistor R1 is prevented from being damaged due to too large input voltage of a power supply, and the flexibility of debugging the circuit is improved.
The utility model also constructs an input reversible device which comprises the input reversible circuit.
The implementation of the utility model has at least the following beneficial effects: the first control unit controls the conduction of each channel in the first switch unit and the second switch unit based on the polarity of power access, so that the power supply can normally supply power even if the power supply is in non-polarity distinguishing connection, and the second control unit realizes the normal power supply without power consumption through the working state of the first control unit.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. An input reversible circuit for providing a non-polarized input port to a load, comprising:
a first switching unit (300) comprising a first channel providing a conductive loop for the negative pole of the load when the power supply polarity is connected correctly, and a second channel providing a conductive loop for the positive pole of the load when the power supply polarity is connected reversely;
a second switching unit (400) comprising a third channel providing a conductive loop for the positive pole of the load when the power supply polarity is correctly connected and a fourth channel providing a conductive loop for the negative pole of the load when the power supply polarity is reversed;
the first control unit (100) is connected with the first switch unit (300) and the second switch unit (400), and controls the conduction of each channel in the first switch unit (300) and the second switch unit (400) based on the access polarity of a power supply;
and the second control unit (200) is connected with the first control unit (100) and is used for controlling the working state of the first control unit (100).
2. The input reversible circuit according to claim 1, characterized in that, the first switch unit (300) is a first relay K1, the second switch unit (400) is a second relay K2;
the first channel consists of an input end and a normally closed end of the first relay K1, the second channel consists of an input end and a normally open end of the first relay K1, the third channel consists of an input end and a normally closed end of the second relay K2, and the fourth channel consists of an input end and a normally open end of the second relay K2;
the input end of the first relay K1 is connected with the power supply input end of the first control unit (100), the grounding end of the first control unit (100) is connected with the input end of a second relay K2 through the second control unit (200), and the first control unit (100) is connected with the power supply ends of the first relay K1 and the second relay K2.
3. The input reversible circuit according to claim 2, characterized in that the first control unit (100) comprises a second diode D2 for preventing the first relay K1 from being excited when the power supply polarity is connected correctly and a third diode D3 for preventing the second relay K2 from being excited when the power supply polarity is connected correctly;
the anode of the second diode D2 is connected to the second power supply terminal of the first relay K1, the anode of the third diode D3 is connected to the second power supply terminal of the second relay K2, and the cathode of the second diode D2 and the cathode of the second triode D3 are connected to the input terminal of the second relay K2.
4. The input-reversible circuit according to claim 3, characterized in that said second control unit (200) is a first diode D1; the grounding end of the first control unit (100) is connected with the anode of the first diode D1, and the anode of the first diode D1 is connected with the input end of the second relay K2.
5. The input reversible circuit according to claim 4, characterized in that, the first control unit (100) comprises a first resistor R1, a third resistor R3, a reference voltage source chip U1, a fourth resistor R4 and a fifth resistor R5;
the first end of the first resistor R1 is a power input end of the first control unit (100), the second end of the first resistor R1 is connected with the cathode of the reference voltage source chip U1, the anode of the reference voltage source chip U1 is the ground end of the first control unit (100) and is connected with the anode of the first diode D1, the cathode of the reference voltage source chip U1 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first power supply ends of the first relay K1 and the second relay K2, the fourth resistor R4 is connected in parallel between the cathode of the reference voltage source chip U1 and the reference voltage input end, and the fifth resistor R5 is connected in parallel between the reference voltage input end and the anode of the reference voltage source chip U1.
6. The input reversible circuit according to claim 5, characterized in that said first control unit (100) further comprises a second resistor R2, a sixth resistor R6 and a seventh resistor R7;
the first resistor R1 is connected to the cathode of the reference voltage source chip U1 through the second resistor R2, the sixth resistor R6 is connected in parallel to two ends of the first resistor R1, and the seventh resistor R7 is connected in parallel to two ends of the second resistor R2.
7. The input-reversible circuit according to any one of claims 5 or 6, wherein the reference voltage source chip U1 is TL 431.
8. The input reversible circuit according to claim 4, characterized in that the first control unit (100) comprises a first resistor R1, a third resistor R3 and a fourth regulator DZ 4;
the first end of the first resistor R1 is a power input end of the first control unit (100), the second end of the first resistor R1 is connected with the cathode of the fourth regulator DZ4, the cathode of the fourth regulator DZ4 is connected to the first power supply ends of the first relay K1 and the first relay K1 through the third resistor R3, and the anode of the fourth regulator DZ4 is the ground end of the first control unit (100) and is connected with the anode of the first diode D1.
9. The input reversible circuit according to claim 8, characterized in that said first control unit (100) further comprises a second resistor R2, a sixth resistor R6 and a seventh resistor R7;
the first resistor R1 is connected to the cathode of the fourth voltage regulator tube DZ4 through the second resistor R2, the sixth resistor R6 is connected in parallel to two ends of the first resistor R1, and the seventh resistor R7 is connected in parallel to two ends of the second resistor R2.
10. An input-reversible apparatus comprising the input-reversible circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123003530.6U CN216672838U (en) | 2021-12-01 | 2021-12-01 | Input reverse connection circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123003530.6U CN216672838U (en) | 2021-12-01 | 2021-12-01 | Input reverse connection circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216672838U true CN216672838U (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123003530.6U Active CN216672838U (en) | 2021-12-01 | 2021-12-01 | Input reverse connection circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216672838U (en) |
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2021
- 2021-12-01 CN CN202123003530.6U patent/CN216672838U/en active Active
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