CN212486848U - Open-circuit and short-circuit fault feedback circuit for constant-current power supply - Google Patents
Open-circuit and short-circuit fault feedback circuit for constant-current power supply Download PDFInfo
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- CN212486848U CN212486848U CN202021551065.2U CN202021551065U CN212486848U CN 212486848 U CN212486848 U CN 212486848U CN 202021551065 U CN202021551065 U CN 202021551065U CN 212486848 U CN212486848 U CN 212486848U
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Abstract
An open circuit and short circuit fault feedback circuit for a constant current power supply comprises a constant current dimming circuit, a signal processing circuit, an open circuit detection circuit, a short circuit detection circuit and a switch power supply circuit for supplying power; the constant-current dimming circuit supplies electric energy to a load through two output terminals; the signal processing circuit is in communication connection with the dimming system through two dimming terminals and is electrically connected with the constant-current dimming circuit; the input end of the open circuit detection circuit and the input end of the short circuit detection circuit are both electrically connected with the output terminal, and the output end of the open circuit detection circuit and the output end of the short circuit detection circuit are both electrically connected with the signal processing circuit. The utility model discloses can open a way among the feedback circuit and short-circuit fault, the safety of guarantee circuit.
Description
Technical Field
The utility model belongs to the technical field of switching power supply technique and specifically relates to an open circuit and short circuit fault feedback circuit for constant current power supply.
Background
At present, the constant current power supply is widely applied to the market and is also very common in a dimmer. However, most of the existing constant current power supplies have no independent open circuit and short circuit detection circuits. The general method is to connect a small resistor in series with the field effect transistor for detection, but some constant current ICs are built-in field effect transistors, so that the detection cannot be realized; when the field effect transistor is externally arranged, open circuit can not be detected when the current is very small, or short circuit can not be detected when the output current is large, so that the system can report by mistake or the protection is not carried out after the fault occurs. Therefore, it is necessary to develop an open-circuit and short-circuit fault feedback circuit of a constant current power supply.
SUMMERY OF THE UTILITY MODEL
The utility model provides an open circuit and short circuit fault feedback circuit for constant current power supply can open circuit and short circuit fault among the feedback circuit, the safety of guarantee circuit.
The utility model provides an open circuit and short circuit fault feedback circuit for a constant current power supply, which comprises a constant current dimming circuit, a signal processing circuit, an open circuit detection circuit, a short circuit detection circuit and a switch power supply circuit for supplying power; the constant-current dimming circuit supplies electric energy to a load through two output terminals; the signal processing circuit is in communication connection with the dimming system through two dimming terminals and is electrically connected with the constant-current dimming circuit; the input end of the open circuit detection circuit and the input end of the short circuit detection circuit are both electrically connected with the output terminal, and the output end of the open circuit detection circuit and the output end of the short circuit detection circuit are both electrically connected with the signal processing circuit.
Preferably, the open circuit detection circuit includes a first triode, a diode, a first zener diode, a first current limiting resistor, a second voltage dividing resistor, a third voltage dividing resistor and a first voltage dividing output terminal, an anode of the diode is electrically connected to the dc power supply, a cathode of the diode is electrically connected to an emitter of the first triode, a negative output terminal of the constant current dimming circuit, the first current limiting resistor and a base of the first triode are electrically connected in sequence, a collector of the first triode, the second voltage dividing resistor, the third voltage dividing resistor and a ground terminal are electrically connected in sequence, two ends of the first zener diode are electrically connected to the emitter and the base of the first triode respectively, one end of the second voltage dividing resistor connected to the third voltage dividing resistor is electrically connected to the first voltage dividing output terminal, and the first voltage dividing output terminal is electrically connected to the signal processing circuit.
Preferably, the short-circuit detection circuit includes a second triode, a second zener diode, a fourth current-limiting resistor, a fifth voltage-dividing resistor, a sixth voltage-dividing resistor, and a second voltage-dividing output terminal, an emitter of the second triode is electrically connected to a positive output terminal of the constant-current dimming circuit, a negative output terminal of the constant-current dimming circuit, the fourth current-limiting resistor, and a base of the second triode are electrically connected in sequence, a collector of the second triode, the fifth voltage-dividing resistor, the sixth voltage-dividing resistor, and a ground terminal are electrically connected in sequence, two ends of the second zener diode are electrically connected to the emitter and the base of the second triode respectively, one end of the fifth voltage-dividing resistor connected to the sixth voltage-dividing resistor is electrically connected to the second voltage-dividing output terminal, and the second voltage-dividing output terminal is electrically connected to the.
Preferably, the input end of the switching power supply circuit is electrically connected with a mains supply.
Preferably, the signal processing circuit is in communication connection with a digital dimming system such as a DALI dimming system or a DMX dimming system through two dimming terminals.
The utility model discloses has following technological effect: the utility model discloses be provided with detection circuitry and short-circuit detection circuitry open a way at power output end, appear opening a way trouble or short-circuit fault when the circuit, corresponding detection circuitry and short-circuit detection circuitry open a way or short-circuit fault can accurately detect out, and rethread signal processing circuit sends fault information to dimming system, avoids appearing misreport or malfunction, ensures the operation of circuit safety and stability.
Drawings
Fig. 1 is a schematic circuit block diagram of an open-circuit and short-circuit fault feedback circuit of a constant current power supply according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of the open-circuit and short-circuit fault feedback circuit of the constant current power supply according to an embodiment of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. An "electrical connection" may be a direct electrical connection between two components or ports or an indirect electrical connection through intervening components. The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides an open circuit and short circuit fault feedback circuit for constant current power supply, as shown in FIG. 1, including constant current dimming circuit 201, signal processing circuit 301, open circuit detection circuitry 401, short circuit detection circuitry 501 and be used for the switching power supply circuit 101 of power supply, switching power supply circuit 101 is to constant current dimming circuit 201, signal processing circuit 301, the circuit power supply that needs the power supply among open circuit detection circuitry 401 and the short circuit detection circuitry 501, switching power supply circuit 101 includes the vary voltage module, exportable constant current dimming circuit 201, signal processing circuit 301, open circuit detection circuitry 401 and short circuit detection circuitry 501 required voltage signal separately.
The constant current dimming circuit 201 may specifically be a dc-to-dc constant current dimming circuit, the constant current dimming circuit 201 includes two output terminals, the two output terminals may specifically include a positive output terminal V + and a negative output terminal V-, the constant current dimming circuit 201 provides electric energy to a load through the two output terminals, and the load may be an LED lamp to be adjusted. The signal processing circuit 301 is connected to the dimming system through two dimming terminals (DIM + and DIM-), and the signal processing circuit 301 is electrically connected to the constant current dimming circuit 201. The dimming system outputs an original dimming signal to the signal processing circuit 301 through the dimming terminal, the signal processing circuit 301 transcodes the dimming signal and outputs a corresponding signal (specifically, a PWM signal or an analog voltage signal) to the constant current dimming circuit 201, and the constant current dimming circuit 201 outputs corresponding electric energy to the LED lamp according to the signal of the signal processing circuit 301, thereby realizing dimming control of the LED lamp. The signal processing circuit 301 may include a conventional single chip microcomputer chip, and the constant current dimming circuit 201 may include a conventional PWM control chip, and since the signal processing circuit 301 and the constant current dimming circuit 201 are both conventional circuits in a dimming circuit, the present embodiment will not specifically describe the internal structure of the circuit.
The input end of the open circuit detection circuit 401 and the input end of the short circuit detection circuit 501 are both electrically connected with the output terminal of the constant current dimming circuit 201, so as to detect whether the circuit output is open or short-circuited, and the output end of the open circuit detection circuit 401 and the output end of the short circuit detection circuit 501 are both electrically connected with the signal processing circuit 301, when an open circuit or a short circuit occurs in the circuit, the corresponding open circuit detection circuit 401 and the short circuit detection circuit 501 can output detection signals to the signal processing circuit 301, the signal processing circuit 301 sends feedback signals to the dimming system, and the dimming system can not send dimming signals to the signal processing circuit 301 any more until the fault is repaired.
In one embodiment, the open circuit detection circuit 401 includes a first transistor Q1, a diode D1, a first zener diode Z1, a first current limiting resistor R1, a second voltage dividing resistor R2, a third voltage dividing resistor R3, and a first voltage dividing output terminal, wherein a dc power VCC, a diode D1, and an emitter of the first transistor are electrically connected in sequence, and the dc power VCC may be supplied by the switching power supply circuit 101. The negative output terminal V-, the first current limiting resistor, and the base of the first triode are sequentially electrically connected, the collector of the first triode, the second voltage dividing resistor, the third voltage dividing resistor, and the ground terminal are sequentially electrically connected, two ends of the first zener diode are respectively electrically connected with the emitter and the base of the first triode, one end of the second voltage dividing resistor connected with the third voltage dividing resistor is electrically connected with the first voltage dividing output terminal, and the first voltage dividing output terminal is electrically connected with the signal processing circuit. When the output is normal, the voltage of the negative output terminal V-is greater than VCC, the first triode Q1 is not turned on, the voltage across the resistor R3 is at a low level, and the signal processing circuit 301 determines that the output terminal is connected with a load and the circuit is not open when detecting that the voltage across the resistor R3 is at a low level. When the output end is open-circuited, no current loop exists between the V + and the V-, the V-voltage is lower than VCC, a triode Q1 of the open-circuit detection circuit is conducted, so that the VCC voltage is divided by a resistor R2 and a resistor R3, then a voltage signal on the resistor R3 is transmitted to the signal processing circuit 301, the signal processing circuit 301 judges that the output terminal is open-circuited after receiving the voltage signal, and sends a feedback signal for outputting the open circuit to the dimming system.
In one embodiment, the short-circuit detection circuit 501 includes a second triode Q2, a second zener diode Z2, a fourth current-limiting resistor R4, a fifth voltage-limiting resistor R5, a sixth voltage-dividing resistor R6 and a second voltage-dividing output terminal, an emitter of the second triode is electrically connected to the positive output terminal V + of the constant-current dimming circuit 201, a negative output terminal V-, a fourth current-limiting resistor R4 of the constant-current dimming circuit 201 and a base of the second triode Q2 are electrically connected in sequence, a collector of the second triode, the fifth voltage-dividing resistor, the sixth voltage-dividing resistor and a ground terminal are electrically connected in sequence, two ends of the second zener diode are electrically connected to an emitter and a base of the second triode respectively, one end of the fifth voltage-dividing resistor connected to the sixth voltage-dividing resistor is electrically connected to the second voltage-dividing output terminal, and the second voltage-dividing output terminal is electrically connected to the signal. When the output is normal, the voltage of the positive output terminal V + is greater than the voltage of the negative output terminal V-, the second triode Q2 is turned on, the voltage of the positive output terminal V + is divided by the resistor R5 and the resistor R6, then the voltage signal on the resistor R6 is transmitted to the signal processing circuit 301, and the signal processing circuit 301 determines that the load connected to the output terminal is normal and has no short circuit when receiving the voltage signal. When the output is short-circuited, the voltage of the positive output terminal V + is equal to the voltage of the negative output terminal V-, the second triode Q2 is not turned on, the voltage on the resistor R6 is at a low level, when the signal processing circuit 301 detects that the voltage on the resistor R6 is at a low level, the signal processing circuit 301 determines that the output terminal is short-circuited, a feedback signal for outputting the short-circuited is sent to the dimming system, and the dimming system receives the open-circuit and short-circuit fault feedback signals and performs corresponding actions.
In an embodiment, the input terminal of the switching power supply circuit 101 is electrically connected to the commercial power, and the switching power supply circuit 101 includes conventional circuits such as a rectifying circuit, a filtering circuit, and a transforming circuit, so as to convert the commercial power into the direct current.
In one embodiment, the signal processing circuit 301 is communicatively connected to the DALI dimming system, the DMX dimming system, or other digital dimming system via two dimming terminals, so as to receive the DALI dimming signal, the DMX dimming signal, or other digital dimming signal.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.
Claims (5)
1. An open circuit and short circuit fault feedback circuit for a constant current power supply, characterized by: the circuit comprises a constant-current dimming circuit, a signal processing circuit, an open-circuit detection circuit, a short-circuit detection circuit and a switching power supply circuit for supplying power; the constant-current dimming circuit supplies electric energy to a load through two output terminals; the signal processing circuit is in communication connection with the dimming system through two dimming terminals and is electrically connected with the constant-current dimming circuit; the input end of the open circuit detection circuit and the input end of the short circuit detection circuit are both electrically connected with the output terminal, and the output end of the open circuit detection circuit and the output end of the short circuit detection circuit are both electrically connected with the signal processing circuit.
2. The open and short circuit fault feedback circuit for a constant current power supply of claim 1, wherein: the open circuit detection circuit comprises a first triode, a diode, a first zener diode, a first current-limiting resistor, a second voltage-dividing resistor, a third voltage-dividing resistor and a first voltage-dividing output end, wherein the anode of the diode is electrically connected with a direct-current power supply, the cathode of the diode is electrically connected with the emitter of the first triode, the negative output terminal of the constant-current dimming circuit, the first current-limiting resistor and the base of the first triode are sequentially and electrically connected, the collector of the first triode, the second voltage-dividing resistor, the third voltage-dividing resistor and the grounding end are sequentially and electrically connected, two ends of the first zener diode are respectively and electrically connected with the emitter and the base of the first triode, one end of the second voltage-dividing resistor, which is connected with the third voltage-dividing resistor, is electrically connected with the first voltage-dividing output end, and.
3. The open and short circuit fault feedback circuit for a constant current power supply of claim 1, wherein: the short-circuit detection circuit comprises a second triode, a second Zener diode, a fourth current-limiting resistor, a fifth voltage-dividing resistor, a sixth voltage-dividing resistor and a second voltage-dividing output end, wherein an emitting electrode of the second triode is electrically connected with a positive output terminal of the constant-current dimming circuit, a negative output terminal of the constant-current dimming circuit, the fourth current-limiting resistor and a base electrode of the second triode are electrically connected in sequence, a collecting electrode of the second triode, the fifth voltage-dividing resistor, the sixth voltage-dividing resistor and a grounding end are electrically connected in sequence, two ends of the second Zener diode are respectively electrically connected with the emitting electrode and the base electrode of the second triode, one end of the fifth voltage-dividing resistor, which is connected with the sixth voltage-dividing resistor, is electrically connected with the second voltage-dividing output end, and the second.
4. The open and short circuit fault feedback circuit for a constant current power supply according to any one of claims 1 to 3, wherein: and the input end of the switching power supply circuit is electrically connected with the mains supply.
5. The open and short circuit fault feedback circuit for a constant current power supply according to any one of claims 1 to 3, wherein: the signal processing circuit is in communication connection with the DALI dimming system or the DMX dimming system through the two dimming terminals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021551065.2U CN212486848U (en) | 2020-07-30 | 2020-07-30 | Open-circuit and short-circuit fault feedback circuit for constant-current power supply |
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| CN202021551065.2U CN212486848U (en) | 2020-07-30 | 2020-07-30 | Open-circuit and short-circuit fault feedback circuit for constant-current power supply |
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| CN212486848U true CN212486848U (en) | 2021-02-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116209119A (en) * | 2023-03-21 | 2023-06-02 | 珠海市圣昌电子有限公司 | DALI dimming power supply load detection circuit and method |
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2020
- 2020-07-30 CN CN202021551065.2U patent/CN212486848U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116209119A (en) * | 2023-03-21 | 2023-06-02 | 珠海市圣昌电子有限公司 | DALI dimming power supply load detection circuit and method |
| CN116209119B (en) * | 2023-03-21 | 2023-08-25 | 珠海市圣昌电子有限公司 | DALI dimming power supply load detection circuit and method |
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