CN214429523U - Automatic change-over switch circuit - Google Patents
Automatic change-over switch circuit Download PDFInfo
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- CN214429523U CN214429523U CN202023335791.3U CN202023335791U CN214429523U CN 214429523 U CN214429523 U CN 214429523U CN 202023335791 U CN202023335791 U CN 202023335791U CN 214429523 U CN214429523 U CN 214429523U
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Abstract
The utility model provides a pair of automatic change-over switch circuit, the input of switch circuit is regarded as to the one end of resistance R13, and the other end of resistance R13 is connected in PMOS pipe Q3's source electrode, and PMOS pipe Q3's drain electrode is connected in diode D3's positive pole, and diode D3's negative pole is as switch circuit's output, and main power supply control circuit's control output is connected in PMOS pipe Q3's grid; the bypass power supply circuit comprises a resistor R3, a silicon chain D4, a PMOS tube Q1 and a bypass control circuit; one end of the resistor R3 is connected with one end of the resistor R13 as an input end, the other end of the resistor R3 is connected with the anode of the silicon chain D4, the cathode of the silicon chain D4 is connected with the source electrode of the PMOS tube Q1, the drain electrode of the PMOS tube Q4 is connected with the cathode of the diode D3 as the output end of the bypass power supply circuit, the control input end of the bypass control circuit is connected with the anode of the diode D3, the control output end of the bypass control circuit is connected with the grid electrode of the PMOS tube Q1, and bypass and main power supply circuit automatic switching can be completed.
Description
Technical Field
The utility model relates to a switch circuit especially relates to an automatic change-over switch circuit.
Background
In the dc power supply, a switch circuit is often arranged between a dc power supply and a load for detecting the dc power, for example, detecting the overvoltage, and when the power supply is turned off during the overvoltage, however, in the low-voltage dc load, especially during the real-time online monitoring power supply, the dc power needs to be kept continuously supplied, but in the existing switch circuit, when the overvoltage occurs, the switch circuit is turned off to supply the power, and the power cannot be continuously supplied to the electric appliance, thereby affecting the use.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an automatic change-over switch circuit, in DC power supply, main power supply circuit can automatic switch to the bypass power supply after because of excessive pressure, device trouble outage to guarantee the power supply continuation and the stability of consumer, resume the back as main power supply circuit, can follow bypass power supply automatic switch to main power supply circuit, facilitate the use.
The utility model provides an automatic change-over switch circuit, which comprises a main power supply circuit and a bypass power supply circuit;
the main power supply circuit comprises a resistor R13, a PMOS tube Q3, a diode D3 and a main power supply control circuit;
one end of the resistor R13 is used as an input end of the switch circuit, the other end of the resistor R13 is connected to the source electrode of the PMOS tube Q3, the drain electrode of the PMOS tube Q3 is connected to the anode of the diode D3, the cathode of the diode D3 is used as an output end of the switch circuit, and the control output end of the main power supply control circuit is connected to the grid electrode of the PMOS tube Q3;
the bypass power supply circuit comprises a resistor R3, a silicon chain D4, a PMOS tube Q1 and a bypass control circuit;
one end of the resistor R3 is connected to one end of the resistor R13 as an input end, the other end of the resistor R3 is connected to the anode of the silicon chain D4, the cathode of the silicon chain D4 is connected to the source of the PMOS tube Q1, the drain of the PMOS tube Q4 is connected to the cathode of the diode D3 as the output end of the bypass power supply circuit, the control input end of the bypass control circuit is connected to the anode of the diode D3, and the control output end of the bypass control circuit is connected to the grid of the PMOS tube Q1.
Further, the main power supply control circuit comprises an overvoltage detection circuit and an MOS tube control circuit;
the overvoltage detection circuit is used for detecting the input voltage of the switch circuit and inputting a low-level control signal to the control input end of the PMOS tube control circuit by the control output end of the overvoltage detection circuit when the overvoltage detection circuit is in overvoltage;
the control output end of the MOS transistor control circuit is connected to the gate of the PMOS transistor Q3, and is used for controlling the on and off of the PMOS transistor Q3.
Further, the overvoltage detection circuit comprises a resistor R4, a resistor R5, a capacitor C3, a capacitor C6, a voltage regulator tube D1 and a voltage regulator tube D2;
one end of a resistor R4 is connected to the output end of the direct-current power supply, the other end of the resistor R4 is grounded through a resistor R5, a common connection point between the resistor R4 and the output end of the direct-current power supply is grounded through a capacitor C3, a common connection point between the resistor R4 and the resistor R5 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of the voltage regulator tube D1 is connected with the positive electrode of a voltage regulator tube D2, the negative electrode of the voltage regulator tube D2 serves as the control output end of the overvoltage detection circuit, and the positive electrode of the voltage regulator tube D1 is grounded through a capacitor C6.
Further, the MOS transistor control circuit includes a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a transistor Q5, a transistor Q4, and a capacitor C4;
one end of the resistor R9 is connected to the source of the PMOS tube Q3, the other end of the resistor R9 is connected in parallel with the capacitor C4 through the resistor R10 and then grounded, the common connection point of the resistor R9 and the resistor R10 is connected to the base of the triode Q5 through the resistor R6, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected in series with the resistor R7 and the resistor R8 and then connected to the source of the PMOS tube Q3, the common connection point of the resistor R7 and the resistor R8 serves as the control output end of the MOS tube control circuit, the collector of the triode Q4 is connected to the common connection point of the resistor R9 and the resistor R10, the emitter of the triode Q4 is grounded, and the base of the triode Q4 serves as the control input end of the MOS tube control circuit.
Further, the bypass control circuit comprises a resistor R1, a resistor R2, a resistor R11, a resistor R12, a transistor Q2, a transistor Q6 and a capacitor C2;
an emitter of the triode Q6 is used as a control input end of the bypass control circuit and is connected with the anode of the diode D3, a collector of the triode Q6 is connected with a base electrode of the triode Q2 through a resistor R14, a base electrode of the triode Q6 is connected with the emitter of the triode Q6 through a resistor R12, and a base electrode of the triode Q6 is grounded through a resistor R11;
the collector of the triode Q2 is grounded, the emitter of the triode Q2 is connected to the source of the PMOS tube Q1 after being connected in series with the resistor R1 through the resistor R2, the common connection point between the resistor R1 and the resistor R2 is grounded through the capacitor C2, and the common connection point between the resistor R1 and the resistor R2 serves as the control output end of the bypass control circuit and is connected to the gate of the PMOS tube Q1.
Further, the bypass power supply circuit further comprises a capacitor C1, a capacitor C7 and a voltage regulator tube D5;
one end of the capacitor C1 is grounded, and the other end is connected to the source electrode of the PMOS tube Q1;
one end of the capacitor C7 is grounded, and the other end is connected to the drain electrode of the PMOS tube Q1;
the cathode of the voltage regulator tube D5 is connected to the common connection point between the capacitor C7 and the drain of the PMOS tube Q1, and the anode of the voltage regulator tube D5 is grounded.
Furthermore, the main power supply circuit further comprises a capacitor C5, one end of the capacitor C5 is connected to the cathode of the diode D3, and the other end of the capacitor C5 is grounded.
The utility model has the advantages that: through the utility model discloses, in DC power supply, main power supply circuit can automatic switch to the bypass power supply after because of excessive pressure, device trouble outage to guarantee the power supply continuation and the stability of consumer, resume the back when main power supply circuit, can follow bypass power supply automatic switch to main power supply circuit, facilitate the use.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings in the specification:
the utility model provides an automatic change-over switch circuit, which comprises a main power supply circuit and a bypass power supply circuit;
the main power supply circuit comprises a resistor R13, a PMOS tube Q3, a diode D3 and a main power supply control circuit;
one end of the resistor R13 is used as an input end of the switch circuit, the other end of the resistor R13 is connected to the source electrode of the PMOS tube Q3, the drain electrode of the PMOS tube Q3 is connected to the anode of the diode D3, the cathode of the diode D3 is used as an output end of the switch circuit, and the control output end of the main power supply control circuit is connected to the grid electrode of the PMOS tube Q3;
the bypass power supply circuit comprises a resistor R3, a silicon chain D4, a PMOS tube Q1 and a bypass control circuit;
one end of the resistor R3 is connected with one end of the resistor R13 as an input end, the other end of the resistor R3 is connected with the anode of the silicon chain D4, the cathode of the silicon chain D4 is connected with the source electrode of the PMOS tube Q1, the drain electrode of the PMOS tube Q4 is connected with the cathode of the diode D3 as the output end of the bypass power supply circuit, the control input end of the bypass control circuit is connected with the anode of the diode D3, and the control output end of the bypass control circuit is connected with the grid electrode of the PMOS tube Q1; wherein:
the bypass power supply circuit further comprises a capacitor C1, a capacitor C7 and a voltage regulator tube D5;
one end of the capacitor C1 is grounded, and the other end is connected to the source electrode of the PMOS tube Q1;
one end of the capacitor C7 is grounded, and the other end is connected to the drain electrode of the PMOS tube Q1;
the cathode of the voltage regulator tube D5 is connected to the common connection point between the capacitor C7 and the drain of the PMOS tube Q1, and the anode of the voltage regulator tube D5 is grounded.
The main power supply circuit further comprises a capacitor C5, one end of a capacitor C5 is connected to the negative electrode of the diode D3, and the other end of the capacitor C5 is grounded; through above-mentioned structure, in DC power supply, main power supply circuit can automatic switch to the bypass power supply after because of overvoltage, device trouble outage to guarantee the power supply continuation and the stability of consumer, resume the back as main power supply circuit, can follow bypass power supply automatic switch to main power supply circuit, facilitate the use.
In this embodiment, the main power supply control circuit includes an overvoltage detection circuit and a MOS transistor control circuit;
the overvoltage detection circuit is used for detecting the input voltage of the switch circuit and inputting a low-level control signal to the control input end of the PMOS tube control circuit by the control output end of the overvoltage detection circuit when the overvoltage detection circuit is in overvoltage;
the control output end of the MOS tube control circuit is connected to the grid electrode of the PMOS tube Q3 and is used for controlling the conduction and the disconnection of the PMOS tube Q3; wherein:
the overvoltage detection circuit comprises a resistor R4, a resistor R5, a capacitor C3, a capacitor C6, a voltage regulator tube D1 and a voltage regulator tube D2;
one end of a resistor R4 is connected to the output end of the direct-current power supply, the other end of the resistor R4 is grounded through a resistor R5, a common connection point between the resistor R4 and the output end of the direct-current power supply is grounded through a capacitor C3, a common connection point between the resistor R4 and the resistor R5 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of the voltage regulator tube D1 is connected with the positive electrode of a voltage regulator tube D2, the negative electrode of the voltage regulator tube D2 serves as the control output end of the overvoltage detection circuit, and the positive electrode of the voltage regulator tube D1 is grounded through a capacitor C6.
The MOS tube control circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q5, a triode Q4 and a capacitor C4;
one end of the resistor R9 is connected to the source of the PMOS tube Q3, the other end of the resistor R9 is connected in parallel with the capacitor C4 through the resistor R10 and then grounded, the common connection point of the resistor R9 and the resistor R10 is connected to the base of the triode Q5 through the resistor R6, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected in series with the resistor R7 and the resistor R8 and then connected to the source of the PMOS tube Q3, the common connection point of the resistor R7 and the resistor R8 serves as the control output end of the MOS tube control circuit, the collector of the triode Q4 is connected to the common connection point of the resistor R9 and the resistor R10, the emitter of the triode Q4 is grounded, and the base of the triode Q4 serves as the control input end of the MOS tube control circuit.
The bypass control circuit comprises a resistor R1, a resistor R2, a resistor R11, a resistor R12, a triode Q2, a triode Q6 and a capacitor C2;
an emitter of the triode Q6 is used as a control input end of the bypass control circuit and is connected with the anode of the diode D3, a collector of the triode Q6 is connected with a base electrode of the triode Q2 through a resistor R14, a base electrode of the triode Q6 is connected with the emitter of the triode Q6 through a resistor R12, and a base electrode of the triode Q6 is grounded through a resistor R11;
the collector of the triode Q2 is grounded, the emitter of the triode Q2 is connected to the source of the PMOS tube Q1 after being connected in series with the resistor R1 through the resistor R2, the common connection point between the resistor R1 and the resistor R2 is grounded through the capacitor C2, and the common connection point between the resistor R1 and the resistor R2 serves as the control output end of the bypass control circuit and is connected to the gate of the PMOS tube Q1.
When the main power supply circuit is normal, the base electrode of the triode Q5 is subjected to voltage division power supply through the resistor R9 and the resistor R10, the triode Q5 is conducted, so that the PMOS tube Q3 is conducted, power is supplied by the main power supply circuit, meanwhile, the PMOS tube Q3 has output, the triode Q6 is conducted, so that the triode Q2 is cut off, the PMOS tube Q1 is cut off, and the bypass power supply circuit does not work;
when the main power supply loop is interrupted, the interruption is except that the power supply stops working, such as overvoltage protection, damage of the PMOS transistor Q3 and the like; at the moment, the triode Q6 is cut off, so that the triode Q2 is conducted, the grid voltage of the PMOS transistor Q1 is pulled down, and the PMOS transistor Q1 is conducted, so that power is supplied by a bypass; even if the main power supply circuit is interrupted due to overvoltage protection at this time, the bypass power supply loop can still provide direct current to the load without impact on the load due to the effects of the resistor R3 and the silicon chain and the peak clipping and valley filling effects of the capacitor C1 and the capacitor C7, so that the power supply continuity of the whole switching circuit is ensured; when the main power supply circuit recovers output, the transistor Q6 is turned on again, and the transistor Q2 and the PMOS transistor Q1 are turned off, so that the power supply is switched automatically without additional control signals or control circuit intervention.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (7)
1. An automatic transfer switch circuit, characterized by: the power supply circuit comprises a main power supply circuit and a bypass power supply circuit;
the main power supply circuit comprises a resistor R13, a PMOS tube Q3, a diode D3 and a main power supply control circuit;
one end of the resistor R13 is used as an input end of the switch circuit, the other end of the resistor R13 is connected to the source electrode of the PMOS tube Q3, the drain electrode of the PMOS tube Q3 is connected to the anode of the diode D3, the cathode of the diode D3 is used as an output end of the switch circuit, and the control output end of the main power supply control circuit is connected to the grid electrode of the PMOS tube Q3;
the bypass power supply circuit comprises a resistor R3, a silicon chain D4, a PMOS tube Q1 and a bypass control circuit;
one end of the resistor R3 is connected to one end of the resistor R13 as an input end, the other end of the resistor R3 is connected to the anode of the silicon chain D4, the cathode of the silicon chain D4 is connected to the source of the PMOS tube Q1, the drain of the PMOS tube Q4 is connected to the cathode of the diode D3 as the output end of the bypass power supply circuit, the control input end of the bypass control circuit is connected to the anode of the diode D3, and the control output end of the bypass control circuit is connected to the grid of the PMOS tube Q1.
2. The automatic transfer switch circuit of claim 1, wherein: the main power supply control circuit comprises an overvoltage detection circuit and an MOS (metal oxide semiconductor) tube control circuit;
the overvoltage detection circuit is used for detecting the input voltage of the switch circuit and inputting a low-level control signal to the control input end of the PMOS tube control circuit by the control output end of the overvoltage detection circuit when the overvoltage detection circuit is in overvoltage;
the control output end of the MOS transistor control circuit is connected to the gate of the PMOS transistor Q3, and is used for controlling the on and off of the PMOS transistor Q3.
3. The automatic transfer switch circuit of claim 2, wherein: the overvoltage detection circuit comprises a resistor R4, a resistor R5, a capacitor C3, a capacitor C6, a voltage regulator tube D1 and a voltage regulator tube D2;
one end of a resistor R4 is connected to the output end of the direct-current power supply, the other end of the resistor R4 is grounded through a resistor R5, a common connection point between the resistor R4 and the output end of the direct-current power supply is grounded through a capacitor C3, a common connection point between the resistor R4 and the resistor R5 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of the voltage regulator tube D1 is connected with the positive electrode of a voltage regulator tube D2, the negative electrode of the voltage regulator tube D2 serves as the control output end of the overvoltage detection circuit, and the positive electrode of the voltage regulator tube D1 is grounded through a capacitor C6.
4. The automatic transfer switch circuit of claim 2, wherein: the MOS tube control circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q5, a triode Q4 and a capacitor C4;
one end of the resistor R9 is connected to the source of the PMOS tube Q3, the other end of the resistor R9 is connected in parallel with the capacitor C4 through the resistor R10 and then grounded, the common connection point of the resistor R9 and the resistor R10 is connected to the base of the triode Q5 through the resistor R6, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected in series with the resistor R7 and the resistor R8 and then connected to the source of the PMOS tube Q3, the common connection point of the resistor R7 and the resistor R8 serves as the control output end of the MOS tube control circuit, the collector of the triode Q4 is connected to the common connection point of the resistor R9 and the resistor R10, the emitter of the triode Q4 is grounded, and the base of the triode Q4 serves as the control input end of the MOS tube control circuit.
5. The automatic transfer switch circuit of claim 1, wherein: the bypass control circuit comprises a resistor R1, a resistor R2, a resistor R11, a resistor R12, a triode Q2, a triode Q6 and a capacitor C2;
an emitter of the triode Q6 is used as a control input end of the bypass control circuit and is connected with the anode of the diode D3, a collector of the triode Q6 is connected with a base electrode of the triode Q2 through a resistor R14, a base electrode of the triode Q6 is connected with the emitter of the triode Q6 through a resistor R12, and a base electrode of the triode Q6 is grounded through a resistor R11;
the collector of the triode Q2 is grounded, the emitter of the triode Q2 is connected to the source of the PMOS tube Q1 after being connected in series with the resistor R1 through the resistor R2, the common connection point between the resistor R1 and the resistor R2 is grounded through the capacitor C2, and the common connection point between the resistor R1 and the resistor R2 serves as the control output end of the bypass control circuit and is connected to the gate of the PMOS tube Q1.
6. The automatic transfer switch circuit of claim 1, wherein: the bypass power supply circuit further comprises a capacitor C1, a capacitor C7 and a voltage regulator tube D5;
one end of the capacitor C1 is grounded, and the other end is connected to the source electrode of the PMOS tube Q1;
one end of the capacitor C7 is grounded, and the other end is connected to the drain electrode of the PMOS tube Q1;
the cathode of the voltage regulator tube D5 is connected to the common connection point between the capacitor C7 and the drain of the PMOS tube Q1, and the anode of the voltage regulator tube D5 is grounded.
7. The automatic transfer switch circuit of claim 1, wherein: the main power supply circuit further comprises a capacitor C5, one end of the capacitor C5 is connected to the negative electrode of the diode D3, and the other end of the capacitor C5 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023335791.3U CN214429523U (en) | 2020-12-31 | 2020-12-31 | Automatic change-over switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023335791.3U CN214429523U (en) | 2020-12-31 | 2020-12-31 | Automatic change-over switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214429523U true CN214429523U (en) | 2021-10-19 |
Family
ID=78055665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023335791.3U Active CN214429523U (en) | 2020-12-31 | 2020-12-31 | Automatic change-over switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214429523U (en) |
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2020
- 2020-12-31 CN CN202023335791.3U patent/CN214429523U/en active Active
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