A new type of driving power supply

Abstract

The present invention discloses a novel driving power supply, which is used to supply power to a lamp. The novel driving power supply comprises a main power driving circuit, a secondary power driving circuit and a detection control circuit; the voltage output end of the main power driving circuit is connected to the sampling voltage input end of the detection control circuit; the control signal output end of the detection control circuit is connected to the control signal input end of the secondary power driving circuit; the detection control circuit controls the secondary power driving circuit to be disconnected or turned on by detecting whether the voltage output by the main power driving circuit is normal or abnormal; the present invention starts the secondary power driving circuit to supply power to the lamp when a fault occurs in the main power driving circuit through the detection control circuit, thereby ensuring that the lamp continues to emit light and will not stop emitting light due to a fault in the main power driving circuit, thereby reducing the probability of safety hazards caused by a fault in the driving power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of driving power supplies, and in particular to a novel driving power supply. Background Art

[0002] At present, LED street lights, LED garden lights, LED tunnel lights, LED floodlights and LED spherical lights are often powered by separate driver power supplies. When the driver power fails, the lamp stops emitting light, forming a dark area, which increases the probability of potential safety hazards. Moreover, it takes at least one to two days from the driver power failure to the technicians rushing to the site for fault analysis and then to the final replacement of the driver power, which further increases the probability of potential safety hazards during this period of time. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of driving power supply to reduce the probability of potential safety hazards caused by failure of the driving power supply.

[0004] For the purpose of the present invention, the technical solution adopted by the present invention is as follows:

[0005] A new type of driving power supply is used to power a lamp. The new type of driving power supply includes a main power driving circuit, a secondary power driving circuit and a detection control circuit; the voltage output end of the main power driving circuit is connected to the sampling voltage input end of the detection control circuit; the control signal output end of the detection control circuit is connected to the control signal input end of the secondary power driving circuit; the detection control circuit controls the secondary power driving circuit to be disconnected or turned on by detecting whether the voltage output by the main power driving circuit is normal or abnormal.

[0006] Furthermore, a switch for controlling the auxiliary power driving circuit to be disconnected or turned on is connected in the auxiliary power driving circuit; and the detection control circuit controls the switch to be opened or closed.

[0007] As a specific implementation, the detection control circuit includes a voltage sampling circuit, a reference voltage generating circuit, an integrated IC and a switch driving circuit; the input end of the voltage sampling circuit is connected to the output end of the main power driving circuit, and the output end is connected to a voltage input end of the integrated IC; the output end of the reference voltage generating circuit is connected to another voltage input end of the integrated IC; the integrated IC compares the voltage output by the voltage sampling circuit with the reference voltage output by the reference voltage generating circuit, and outputs a control signal to the switch driving circuit; the switch driving circuit controls the switch to be opened or closed.

[0008] As a specific implementation, the integrated IC includes a detection control chip, the model of the detection control chip is STC8A4K16S2A12,

[0009] As a specific implementation, the voltage sampling circuit includes a fifty-fourth resistor, a fifty-fifth resistor and a thirty-first capacitor, one end of the fifty-fourth resistor is connected to one end of the thirty-first capacitor to receive the voltage output by the main power drive circuit, the other end of the fifty-fourth resistor is connected to one end of the fifty-fifth resistor and is connected to the sampling voltage input pin of the integrated IC, and the other end of the thirty-first capacitor and the other end of the fifty-fifth resistor are grounded.

[0010] As a specific implementation, the reference voltage generating circuit includes a fifty-third resistor, a second polarized capacitor and a third precision reference voltage, one end of the fifty-third resistor and the positive electrode of the second polarized capacitor are connected to a power supply, the other end of the fifty-third resistor is connected to the cathode and control electrode of the third precision reference voltage, and is connected to the reference voltage input pin of the integrated IC, the negative electrode of the second polarized capacitor and the anode of the third precision reference voltage are grounded,

[0011] As a specific implementation, the switch includes a relay, and the switch driving circuit includes a fifty-sixth resistor, a fifty-seventh resistor, a fifty-eighth resistor, a thirty-second capacitor, an eleventh diode and a third NPN transistor. The control signal output pin of the integrated IC is connected to one end of the fifty-eighth resistor, the other end of the fifty-eighth resistor is connected to one end of the fifty-seventh resistor and the base of the third NPN transistor, the other end of the fifty-seventh resistor and the emitter of the third NPN transistor are grounded, the collector of the third NPN transistor is connected to the positive electrode of the eleventh diode, one end of the thirty-second capacitor and one end of the coil of the switch, the negative electrode of the eleventh diode, the other end of the fifty-sixth resistor and the other end of the coil of the switch are connected to the power supply, and the normally closed contact and the normally open contact of the switch are connected to the auxiliary power supply driving circuit.

[0012] Furthermore, the detection control circuit further comprises an interface chip; the interface chip is connected to the integrated IC and the lamp control system, and is used for transmitting the fault signal output by the integrated IC to the lamp control system.

[0013] Furthermore, the output power of the secondary power driving circuit is less than the normal output power of the main power driving circuit.

[0014] As a specific implementation, the main power drive circuit includes a first input circuit, a first EMI filter circuit, a first rectifier circuit, a first filter circuit, a first DC-AC conversion circuit, a first rectifier filter circuit and a first output circuit connected in sequence, and the detection control circuit detects the voltage output by the first output circuit.

[0015] As a specific implementation, the auxiliary power supply drive circuit includes a second input circuit, a second EMI filter circuit, a switch, a second rectifier circuit, a second filter circuit, a second DC-AC conversion circuit, a second rectifier filter circuit, and a second output circuit connected in sequence, and the detection control circuit controls the switch to open or close.

[0016] Furthermore, the main power drive circuit further includes a first feedback control loop, and the first feedback loop feeds back the voltage output by the main power drive circuit to control the voltage output by the main power drive circuit.

[0017] Furthermore, the secondary power drive circuit further includes a second feedback control loop, and the second feedback control loop feeds back the voltage output by the secondary power drive circuit to control the voltage output by the secondary power drive circuit.

[0018] As a specific implementation, the first feedback control loop includes a first feedback circuit and a first control circuit, the input end of the first feedback circuit is connected to the output end of the main power drive circuit, the output end is connected to the feedback signal input end of the first control circuit, and the control signal output end of the first control circuit is connected to the control signal input end of the main power drive circuit.

[0019] As a specific implementation, the second feedback loop includes a second feedback circuit and a second control circuit, the input end of the second feedback circuit is connected to the output end of the auxiliary power supply driving circuit, the output end is connected to the feedback signal input end of the second control circuit, and the control signal output end of the second control circuit is connected to the control signal input end of the auxiliary switch driving circuit.

[0020] As a specific implementation, the first feedback circuit includes a first sampling circuit, a first comparison circuit and a first feedback output circuit. The input end of the first sampling circuit is connected to the output end of the main power drive circuit, and the output end is connected to the input end of the first comparison circuit. The first comparison circuit compares the voltage sampled by the first sampling circuit with a reference voltage and outputs the comparison result to the first feedback output circuit. The feedback information output end of the first feedback output circuit is connected to the feedback information input end of the first control circuit.

[0021] As a specific implementation, the first feedback circuit includes a second sampling circuit, a second comparison circuit and a second feedback output circuit, the input end of the second sampling circuit is connected to the output end of the auxiliary power supply driving circuit, and the output end is connected to the input end of the second comparison circuit, the second comparison circuit compares the voltage sampled by the second sampling circuit with a reference voltage, and outputs the comparison result to the second feedback output circuit; the feedback information output end of the second feedback output circuit is connected to the feedback information input end of the second control circuit.

[0022] Beneficial effects of the present invention:

[0023] It can be seen from the above technical solutions that the present invention starts the auxiliary power drive circuit to supply power to the lamp when the main power drive circuit fails through the detection control circuit, so as to ensure that the lamp continues to emit light, and will not stop emitting light because of the failure of the main power drive circuit, thereby reducing the probability of safety hazards caused by the failure of the driving power supply. Further, the present invention controls the auxiliary power drive circuit to supply power when the main power drive circuit is abnormal by controlling the switch connected to the auxiliary power drive circuit to be disconnected or closed. Further, the present invention samples the voltage output by the main power drive circuit through the voltage sampling circuit, and then compares the sampled voltage with the reference voltage through the integrated IC, and judges whether the main power drive circuit works normally or abnormally according to the comparison result, and finally the integrated IC outputs a control signal to the drive circuit, and the drive circuit controls the switch to be disconnected or closed. Further, the present invention sends the fault signal output by the integrated IC to the lamp control system through the interface chip, so that the maintenance personnel can receive the fault signal through the lamp control system and perform maintenance in time. Further, the present invention adopts the auxiliary power drive circuit whose output power is less than the normal output power of the main power drive circuit, so as to maintain the basic lighting requirements of the lamp while facilitating the maintenance personnel to find the faulty lamp. Furthermore, the new driving power supply can be used independently without adding any auxiliary control signals to achieve the goal of automatically switching the auxiliary power driving circuit for power supply when the main power driving circuit is damaged, and it is compatible with the lighting control system. When the main power driving circuit fails, a fault signal is sent to the lighting control system, which is convenient for reducing costs; the output power of the auxiliary power driving circuit is equal to half of the main power driving circuit. Compared with the main power driving circuit and the auxiliary power driving circuit having equal output powers, it has a smaller size, which makes it easier to reduce the size of the new driving power supply and install the new driving power supply in a relatively small space such as a lamp pole; the actual manufacturing process of the new driving power supply integrates all components in the same casing, and is potted to achieve an outdoor street lamp waterproof grade of IP65 or above, which is not only easy to assemble but also has a better waterproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 is a structural block diagram of a novel driving power supply provided by an embodiment of the present invention;

[0026] Figure 2 is a structural block diagram of a main power drive circuit provided by an embodiment of the present invention;

[0027] Figure 3 is a structural block diagram of a secondary power supply driving circuit provided by an embodiment of the present invention;

[0028] Figure 4 is a structural block diagram of a detection control circuit provided by an embodiment of the present invention;

[0029] Figure 5 is a circuit schematic diagram of a main power drive circuit provided by an embodiment of the present invention;

[0030] Figure 6 is a circuit schematic diagram of a secondary power supply driving circuit provided by an embodiment of the present invention;

[0031] Figure 7 is a circuit schematic diagram of a detection control chip provided by an embodiment of the present invention;

[0032] Figure 8 is a circuit schematic diagram of a reference voltage generating circuit provided by an embodiment of the present invention;

[0033] Fig. 9 is a circuit schematic diagram of a voltage sampling circuit provided by an embodiment of the present invention;

[0034] Fig.10 is a circuit schematic diagram of a switch driving circuit provided by an embodiment of the present invention;

[0035] Fig.11 It is a circuit schematic diagram of the interface chip provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] like Figure 1As shown, a new type of driving power supply includes a main power driving circuit, an auxiliary power driving circuit and a detection control circuit; the input end of the main power driving circuit and the input end of the auxiliary power driving circuit receive an AC voltage; the detection control circuit detects the voltage output by the main power driving circuit, and controls the auxiliary power driving circuit to be disconnected or turned on; when the voltage output by the main power driving circuit is normal, the detection control circuit controls the auxiliary power driving circuit to be disconnected, and the main power driving circuit supplies power to the lamp; when the voltage output by the main power driving circuit is abnormal, the detection control circuit controls the auxiliary power driving circuit to be turned on, and the auxiliary power driving circuit supplies power to the lamp; the lamp includes LED street lamps, LED garden lamps, LED tunnel lamps, LED floodlights and LED spherical lamps, and is not limited to a certain type of lamp.

[0039] In this embodiment, when the voltage output by the main power drive circuit is abnormal, the detection control circuit outputs a fault signal to the lamp control system; the maintenance personnel can know that the lamp driving power has failed through the fault signal received by the lamp control system, which is convenient for the maintenance personnel to perform maintenance in time; when the auxiliary power drive circuit is turned on, the output power of the auxiliary power drive circuit is equal to half of the normal output power of the main power drive circuit; the brightness of the lamp powered by the auxiliary power drive circuit is darker than the brightness when powered by the main power drive circuit, while maintaining the basic lighting requirements of the lamp, it is convenient for maintenance personnel to find the faulty lamp; in other embodiments, the output power of the auxiliary power drive circuit is less than or equal to the normal output power of the main power drive circuit.

[0040] In this embodiment, the new driving power supply can be used independently, and the main power driving circuit can be automatically switched to the auxiliary power driving circuit for power supply without adding any auxiliary control signal. It is also compatible with the lamp control system. When the main power driving circuit fails, a fault signal is sent to the lamp control system, which is convenient for reducing costs. The output power of the auxiliary power driving circuit is equal to half of the main power driving circuit. Compared with the main power driving circuit and the auxiliary power driving circuit, which have equal output powers, the volume is smaller, which makes it easier to reduce the volume of the new driving power supply and install the new driving power supply in a relatively small space such as a lamp pole. The actual manufacturing process of the new driving power supply integrates all components in the same casing, and is potted to achieve an outdoor street lamp waterproof grade of IP65 or above, which is not only easy to assemble but also has a better waterproof effect.

[0041] In this embodiment, when the first DC voltage output by the main power drive circuit is normal, the detection control circuit controls the switch K1 to be disconnected, and the auxiliary power drive circuit is disconnected, and the lamp is powered by the main power drive circuit; when the voltage output by the main power drive circuit is abnormal, the detection control circuit controls the switch K1 to be closed, and the auxiliary power drive circuit is turned on, and the lamp is powered by the auxiliary power drive circuit.

[0042] like Figure 2 As shown, the main power drive circuit includes a first input circuit, a first EMI filter circuit, a first rectifier circuit, a first filter circuit, a first DC-AC conversion circuit, a first rectifier filter circuit, a first output circuit and a first feedback control loop; the input end of the first input circuit receives an AC voltage, and the output end is connected to the input end of the first EMI filter circuit; the output end of the first EMI filter circuit is connected to the input end of the first rectifier circuit; the output end of the first rectifier circuit is connected to the input end of the first filter circuit; the output end of the first filter circuit is connected to the input end of the first DC-AC conversion circuit and the power supply end of the first control circuit; the output end of the first DC-AC conversion circuit is connected to the input end of the first rectifier filter circuit; the output end of the first rectifier filter circuit is connected to the input end of the first output circuit; the output end of the first output circuit outputs a first DC voltage and is connected to the input end of the first feedback control loop; the control signal output end of the first feedback control loop is connected to the control signal input end of the first DC-AC conversion circuit.

[0043] In this embodiment, the first EMI filter circuit is used to filter the AC voltage received by the first input circuit to suppress high-frequency interference and equipment interference; the first rectifier circuit is used to rectify the signal output by the first EMI filter circuit and convert the AC signal into a DC signal; the first filter circuit is used to filter the rectified signal; the first DC-AC conversion circuit is used to convert the DC signal into an AC signal; the first rectifier and filter circuit is used for rectification and filtering, converting the AC signal into a DC signal and filtering it; the first output circuit is used to output a first DC voltage; the first feedback control loop is used to feed back the first DC voltage output by the first output circuit, output a control signal to the first DC-AC conversion circuit, control the voltage value output by the first DC-AC conversion circuit, and then control the voltage value of the first DC voltage output by the first output circuit.

[0044] like Figure 2 As shown, the first feedback control loop includes a first feedback circuit and a first control circuit; the input end of the first feedback circuit is connected to the output end of the first output circuit to receive the first DC voltage output by the first output circuit, and the output end is connected to the signal input end of the first control circuit to output a feedback signal to the first control circuit; the control signal output end of the first control circuit is connected to the control signal input end of the first DC-AC conversion circuit to output a control signal to the first DC-AC conversion circuit; Figure 3As shown, the first feedback circuit includes a first sampling circuit, a first comparison circuit and a first feedback output circuit; the first sampling circuit is used to sample the first DC voltage output by the first output circuit; the first comparison circuit is used to compare the sampling voltage output by the first sampling circuit with a set reference voltage, and feed back the comparison result to the first feedback output circuit; the first feedback output circuit outputs a feedback signal to the first control circuit according to the comparison result of the first comparison circuit.

[0045] like Figure 5 As shown, in this embodiment, the first input circuit includes a first fuse F1 and a first varistor TV1; the first EMI filter includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2 and a first transformer T1; the first rectifier circuit includes a first rectifier bridge DB1; the first filter circuit includes a third capacitor C3; the first DC-AC conversion circuit includes an eleventh resistor R11, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fourth capacitor C4, a first diode D1, a third diode D3, a first NPN transistor Q1 and a second transformer T2; the first rectifier and filter circuit includes a twentieth resistor R20, a twenty-first resistor R21, an eleventh capacitor C11, a twelfth capacitor C12 and a fifth diode D5; the first output circuit includes a first resistor R11, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fourth capacitor C4, a first diode D1, a third diode D3, a first NPN transistor Q1 and a second transformer T2; the first rectifier and filter circuit includes a twentieth resistor R20, a twenty-first resistor R21, an eleventh capacitor C11, a twelfth capacitor C12 and a fifth diode D5 inductor L1 and thirteenth capacitor C13; the first sampling circuit includes twenty-third resistor R23 and twenty-fifth resistor R25; the first comparison circuit includes twenty-fourth resistor R24, twenty-sixth resistor R26, fourteenth capacitor C14 and a first precision reference voltage; the first feedback output circuit includes eighteenth resistor R18, nineteenth resistor R19, twenty-second resistor R22, ninth capacitor C9, fourth diode D4 and first photoelectric isolator OC1; the first control circuit includes third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, twelfth resistor R12, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, tenth capacitor C10, second diode D2 and first single-stage PFC chip U1.

[0046] like Figure 5As shown, the first fuse F1 is connected to an AC signal input terminal, and the other end is connected to one end of the first varistor TV1, one end of the first resistor R1, one end of the first capacitor C1 and one input terminal of the first transformer T1; the other end of the first resistor R1 is connected to one end of the second resistor R2; the other end of the first varistor TV1, the other end of the second resistor R2, the other end of the first capacitor C1, and the other input terminal of the first transformer T1 are connected to another AC signal input terminal; an output terminal of the first transformer T1 is connected to one end of the second capacitor C2 and an AC signal input terminal of the first rectifier bridge DB1, and the other output terminal of the first transformer T1 is connected to the other end of the second capacitor C2 and another AC signal input terminal of the first rectifier bridge DB1; the positive output terminal of the first rectifier bridge DB1 is connected to one end of the third capacitor C3, one end of the third resistor R3, one end of the eighth resistor R8, one end of the eleventh resistor R11, one end of the fourth capacitor C4 and one end of the first primary coil of the second transformer T2, and the negative output terminal of the first rectifier bridge DB1 is connected to the third capacitor C3 and grounded GND; the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected in series in sequence, the other end of the fifth resistor R5 is connected to one end of the sixth capacitor C6, one end of the seventh resistor R7 and the MULT port of the first single-stage PFC chip U1, and the other end of the sixth capacitor C6 and the other end of the seventh resistor R7 are grounded GND; one end of the sixth resistor R6 and one end of the fifth capacitor C5 are connected to the COMP port of the first single-stage PFC chip U1; the other end of the sixth resistor R6 and the other end of the fifth capacitor C5 are connected to the I The NV port is connected to one end of the eighteenth resistor R18; the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are connected in series in sequence, and the other end of the tenth resistor R10 is connected to the VCC port of the first single-stage PFC chip U1, one end of the eighth capacitor C8, the cathode of the fourth diode D4, one end of the ninth capacitor C9, the cathode of the third diode D3 and an output end of the first photoelectric isolator OC1; the OUT port of the first single-stage PFC chip U1 is connected to one end of the twelfth resistor R12 and the cathode of the second diode D2; the other end of the eighth capacitor C8 is grounded to GN D; the other end of the twelfth resistor R12, the positive electrode of the second diode D2, one end of the fifteenth resistor R15 and the base of the first NPN transistor Q1 are connected; the GND port of the first single-stage PFC chip U1 is grounded GND; the ZCD port of the first single-stage PFC chip U1 is connected to one end of the seventh capacitor C7 and one end of the thirteenth resistor R13; the other end of the seventh capacitor C7 is grounded GND; the CS port of the first single-stage PFC chip U1 is connected to one end of the tenth capacitor C10 and one end of the seventeenth resistor R17; the other end of the tenth capacitor C10 is grounded GND;The other end of the seventeenth resistor R17 is connected to one end of the sixteenth resistor R16 and the emitter of the first NPN transistor Q1; the other end of the fifteenth resistor R15 and the other end of the sixteenth resistor R16 are grounded GND; the other end of the eleventh resistor R11 and the other end of the fourth capacitor C4 are connected to the cathode of the first diode D1; the anode of the first diode D1 is connected to the collector of the first NPN transistor Q1 and the other end of the first primary coil of the second transformer T2; the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14 and one end of the second primary coil of the second transformer T2; the other end of the fourteenth resistor R14 is connected to the anode of the third diode D3; the other end of the second primary coil of the second transformer T2 is grounded GND; one end of the secondary coil of the second transformer T2 is connected to one end of the twentieth resistor R20, one end of the twenty-first resistor R21 and the anode of the fifth diode D5; the other end of the twentieth resistor R20 and the other end of the twenty-first resistor R21 are connected to one end of the eleventh capacitor C11; the eleventh capacitor C11 The other end of the first inductor L1 is connected to one end of the thirteenth capacitor C13 and one end of the twenty-third resistor R23; the other end of the twelfth capacitor C12 is connected to the other end of the thirteenth capacitor C13 and the ground GND.

[0047] like Figure 5 As shown, the other end of the twenty-third resistor R23 is connected to one end of the twenty-fourth resistor R24, one end of the twenty-fifth resistor R25, one end of the twenty-sixth resistor R26 and the control electrode of the first precision reference voltage; the other end of the twenty-fourth resistor R24 ​​is connected to one end of the fourteenth capacitor C14; the other end of the fourteenth capacitor C14 is connected to the cathode of the first precision reference voltage and an input end of the first photoelectric isolator OC1; the other end of the twenty-fifth resistor R25, the other end of the twenty-sixth resistor R26 and the anode of the first precision reference voltage are grounded GND; the other end of the twenty-second resistor R22 is connected to the other input end of the first photoelectric isolator OC1; the other output end of the first photoelectric isolator OC1 is connected to the other end of the eighteenth resistor R18 and one end of the nineteenth resistor R19; the other end of the nineteenth resistor R19 is grounded GND; the other end of the ninth capacitor C9 and the positive electrode of the fourth diode D4 are grounded GND.

[0048] like Figure 3As shown, the auxiliary power supply driving circuit includes a second input circuit, a second EMI filter circuit, a second rectifier circuit, a second filter circuit, a second DC-AC conversion circuit, a second rectifier filter circuit, a second output circuit, a switch K1 and a second feedback control loop; the input end of the second input circuit receives an AC voltage, and the output end is connected to the input end of the second EMI filter circuit; the output end of the second EMI filter circuit is connected to the input end of the second rectifier circuit; the output end of the second rectifier circuit is connected to one end of the switch K1, and the other end of the switch K1 is connected to the input end of the second filter circuit; the output end of the second filter circuit is connected to the input end of the second DC-AC conversion circuit and the power supply end of the second control circuit; the output end of the second DC-AC conversion circuit is connected to the input end of the second rectifier filter circuit; the output end of the second rectifier filter circuit is connected to the input end of the second output circuit; the output end of the second output circuit outputs a second DC voltage and is connected to the input end of the second feedback control loop; the control signal output end of the second feedback control loop is connected to the control signal input end of the second DC-AC conversion circuit.

[0049] In this embodiment, the second EMI filter circuit is used to filter the AC voltage received by the second input circuit to suppress high-frequency interference and equipment interference; the second rectifier circuit is used to rectify the signal output by the second EMI filter circuit and convert the AC signal into a DC signal; the second filter circuit is used to filter the rectified signal; the second DC-AC conversion circuit is used to convert the DC signal into an AC signal; the second rectifier and filter circuit is used for rectification and filtering, converting the AC signal into a DC signal and filtering it; the second output circuit is used to output a second DC voltage; the second feedback control loop is used to feed back the second DC voltage output by the second output circuit, output a control signal to the second DC-AC conversion circuit, control the voltage value output by the second DC-AC conversion circuit, and then control the voltage value of the second DC voltage output by the second output circuit.

[0050] like Figure 3 As shown, the second feedback control loop includes a second feedback circuit and a second control circuit; the input end of the second feedback circuit is connected to the output end of the second output circuit to receive the second DC voltage output by the second output circuit, and the output end is connected to the signal input end of the second control circuit to output a feedback signal to the second control circuit; the control signal output end of the second control circuit is connected to the control signal input end of the second DC-AC conversion circuit to output a control signal to the second DC-AC conversion circuit; Figure 3As shown, the second feedback circuit includes a second sampling circuit, a second comparison circuit and a second feedback output circuit; the second sampling circuit is used to sample the second DC voltage output by the second output circuit; the second comparison circuit is used to compare the sampling voltage output by the second sampling circuit with a set reference voltage, and feed back the comparison result to the second feedback output circuit; the second feedback output circuit outputs a feedback signal to the second control circuit according to the comparison result of the second comparison circuit.

[0051] like Figure 6 As shown, in this embodiment, the second input circuit includes a second fuse F2 and a second varistor TV2; the second EMI filter includes a twenty-seventh resistor R27, a twenty-eighth resistor R28, a fifteenth capacitor C15, a sixteenth capacitor C16 and a third transformer T3; the second rectifier circuit includes a second rectifier bridge DB2; the second filter circuit includes a seventeenth capacitor C17; the second DC-AC conversion circuit includes a thirty-seventh resistor R37, a thirty-ninth resistor R39, a fortieth resistor R40, a forty-first resistor R41, a forty-second resistor R42, an eighteenth capacitor C18, a sixth diode D6, an eighth diode D8, a second NPN transistor Q2 and a fourth transformer T4; the second rectifier and filter circuit includes a forty-sixth resistor R46, a forty-seventh resistor R47, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26 and a tenth diode D10; the second output circuit includes a second inductor L2 and a twenty-seventh capacitor C27; the second sampling circuit includes a forty-ninth resistor R49 and a fifty-first resistor R51; the second comparison circuit includes a fiftieth resistor R50, a fifty-second resistor R52, a twenty-eighth capacitor C28 and a second precision reference voltage; the second feedback output circuit includes a forty-fourth resistor R44, a forty-fifth resistor R45, a forty-eighth resistor R48, a twenty-third capacitor C23, a ninth diode D9 and a second photoelectric isolator OC2; the second control circuit includes a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-eighth resistor R38, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-fourth capacitor C24, a seventh diode D7 and a second single-stage PFC chip U2.

[0052] like Figure 6As shown, the second fuse F2 is connected to an AC signal input terminal, and the other end is connected to one end of the second varistor TV2, one end of the twenty-seventh resistor R27, one end of the fifteenth capacitor C15 and an input terminal of the third transformer T3; the other end of the twenty-seventh resistor R27 is connected to one end of the twenty-eighth resistor R28; the other end of the first varistor TV1, the other end of the twenty-eighth resistor R28, the other end of the fifteenth capacitor C15 and another input terminal of the third transformer T3 are connected to another AC signal input terminal; an output terminal of the third transformer T3 is connected to one end of the sixteenth capacitor C16 and an AC signal input terminal of the second rectifier bridge DB2, and the other output terminal of the third transformer T3 is connected to the other end of the sixteenth capacitor C16 and another AC signal input terminal of the second rectifier bridge DB2; the positive output terminal of the second rectifier bridge DB2 is connected to one end of the switch K1; the other end of the switch K1 is connected to one end of the seventeenth capacitor C17, one end of the twenty-ninth resistor R29, one end of the thirty-fourth resistor R34, one end of the thirty-seventh resistor R37, the eighteenth One end of the capacitor C18 is connected to one end of the first primary coil of the fourth transformer T4; the negative output end of the second rectifier bridge DB2 is connected to the other end of the seventeenth capacitor C17 and grounded GND; the twenty-ninth resistor R29, the thirtieth resistor R30 and the thirty-first resistor R31 are connected in series in sequence, and the other end of the thirty-first resistor R31 is connected to one end of the twentieth capacitor C20, one end of the thirty-third resistor R33 and the MULT port of the second single-stage PFC chip U2; the other end of the twentieth capacitor C20 and the thirty-third resistor R The other end of 33 is connected to the ground GND; one end of the 32nd resistor R32 and one end of the 19th capacitor C19 are connected to the COMP port of the second single-stage PFC chip U2; the other end of the 32nd resistor R32 and the other end of the 19th capacitor C19 are connected to the INV port of the second single-stage PFC chip U2 and one end of the 44th resistor R44; the 34th resistor R34, the 35th resistor R35 and the 36th resistor R36 are connected in series in sequence, and the other end of the 36th resistor R36 is connected to the VCC of the second single-stage PFC chip U2 The OUT port of the second single-stage PFC chip U2 is connected to one end of the 38th resistor R38 and the cathode of the 7th diode D7; the other end of the 38th resistor R38 and the anode of the 7th diode D7 are connected to one end of the 41st resistor R41 and the base of the second NPN transistor Q2; the GND port of the second single-stage PFC chip U2 is connected to the ground GND;The ZCD port of the second single-stage PFC chip U2 is connected to one end of the twenty-first capacitor C21 and one end of the thirty-ninth resistor R39; the other end of the twenty-first capacitor C21 is grounded GND; the CS port of the second single-stage PFC chip U2 is connected to one end of the twenty-fourth capacitor C24 and one end of the forty-third resistor R43; the other end of the twenty-fourth capacitor C24 is grounded GND; the other end of the forty-third resistor R43 is connected to one end of the forty-second resistor R42 and the emitter of the second NPN transistor Q2; the other end of the forty-first resistor R41 and the other end of the forty-second resistor R42 are grounded GND; The other end of the seventeenth resistor R37 and the other end of the eighteenth capacitor C18 are connected to the cathode of the sixth diode D6; the anode of the sixth diode D6 is connected to the collector of the second NPN transistor Q2 and the other end of the first primary coil of the fourth transformer T4; the other end of the thirty-ninth resistor R39 is connected to one end of the fortieth resistor R40 and one end of the second primary coil of the fourth transformer T4; the other end of the fortieth resistor R40 is connected to the anode of the eighth diode D8; the other end of the second primary coil of the fourth transformer T4 is grounded GND; one end of the secondary coil of the fourth transformer T4 is connected to the forty-sixth resistor R46 The other end of the 46th resistor R46 and the other end of the 47th resistor R47 are connected to one end of the 25th capacitor C25; the other end of the 25th capacitor C25, the cathode of the 10th diode D10 are connected to one end of the 26th capacitor C26, one end of the second inductor L2 and one end of the 48th resistor R48; the other end of the second inductor L2 is connected to one end of the 27th capacitor C27 and one end of the 49th resistor R49; the other end of the 26th capacitor C26 is connected to the other end of the 27th capacitor C27 and is grounded to GND.;

[0053] like Figure 6As shown, the other end of the forty-ninth resistor R49 is connected to one end of the fiftieth resistor R50, one end of the fifty-first resistor R51, one end of the fifty-second resistor R52 and the control electrode of the second precision reference voltage; the other end of the fiftieth resistor R50 is connected to one end of the twenty-eighth capacitor C28; the other end of the twenty-eighth capacitor C28 is connected to the cathode of the second precision reference voltage and an input end of the second photoelectric isolator OC2; the other end of the fifty-first resistor R51, the other end of the fifty-second resistor R52 and the anode of the second precision reference voltage are grounded GND; the other end of the forty-eighth resistor R48 is connected to the other input end of the second photoelectric isolator OC2; the other output end of the second photoelectric isolator OC2 is connected to the other end of the forty-fourth resistor R44 and one end of the forty-fifth resistor R45; the other end of the forty-fifth resistor R45 is grounded GND; the other end of the twenty-third capacitor C23 and the positive electrode of the ninth diode D9 are grounded GND.

[0054] In this embodiment, the first single-stage PFC chip U1 and the second single-stage PFC chip U2 are both of model L8562; the switch K1 is a relay; the first capacitor C1 and the fifteenth capacitor C15 are both electrolytic capacitors; the first precision reference voltage, the second precision reference voltage and the third precision reference voltage are of model TL431; in order to achieve that the output power of the auxiliary power supply driving circuit is half of the output power of the main power supply driving circuit, the capacitance value of the fifteenth capacitor C15 is half of the capacitance value of the first capacitor C1, the inductance of the first transformer T1 is approximately half of the inductance of the third transformer T3, and the current value of the third NPN transistor Q3 is the same as that of the first NPN transistor. The current value of the tenth diode D10 is approximately half of the current value of the fifth diode D5. For example, when the output power of the main power drive circuit is 100w and the output power of the auxiliary power drive circuit is 50w, the capacitance value of the first capacitor C1 is 100uF / 400V, the capacitance value of the fifteenth capacitor C15 is 50uF / 400V, the inductance of the first transformer T1 is approximately 0.4mH, the inductance of the third transformer T3 is approximately 0.7-0.8mH, the current value of the first NPN transistor Q1 is 12A / 700V, the current value of the third NPN transistor Q3 is 6A / 700V, the current value of the fifth diode D5 is approximately 9A / 100V, and the current value of the tenth diode D10 is 5A / 100V.

[0055] like Figure 4As shown, the detection control circuit includes a voltage sampling circuit, a reference voltage generating circuit, an integrated IC and a data interface; the voltage sampling circuit receives the first DC voltage output by the main power drive circuit, and outputs the first voltage to the integrated IC; the reference voltage generating circuit outputs the reference voltage to the integrated IC; the integrated IC compares the first voltage with the reference voltage, and outputs a control signal to the switch drive circuit according to the comparison result, and then the switch drive circuit controls the switch K1 to close or open, and outputs fault information to the data interface according to the comparison result, and the data interface sends the fault information to the lamp control system.

[0056] like Figure 7 , 8, 9, 10, and 11, the integrated IC includes a detection control chip U3 and its peripheral circuits, and the model of the detection control chip U3 is STC8A4K16S2A12; the reference voltage generating circuit includes a fifty-third resistor R53, a second polar capacitor EC2, and a third precision reference voltage; the voltage sampling circuit includes a fifty-fourth resistor R54, a fifty-fifth resistor R55, and a thirty-first capacitor C31; the switch driving circuit includes a fifty-sixth resistor R56, a fifty-seventh resistor R57, a fifty-eighth resistor R58, a thirty-second capacitor C32, an eleventh diode D11, and a third NPN transistor Q3; the data interface includes an interface chip UM1, a first TVS diode TVS1, and a second TVS diode TVS2, and the interface chip UM1 is an RS485 interface chip.

[0057] like Figure 7, 8, 9, 10, 11, one end of the fifty-third resistor R53 and the positive electrode of the second polar capacitor EC2 are connected to the power supply VCC; the other end of the fifty-third resistor R53 is connected to the cathode and control electrode of the third precision reference voltage, and is connected to the reference voltage input pin 11 of the detection control chip U3; the negative electrode of the second polar capacitor EC2 and the anode of the third precision reference voltage are grounded DGND; one end of the fifty-fourth resistor R54 and one end of the thirty-first capacitor C31 are connected to the common end of the thirteenth capacitor C13 and the first inductor L1; the other end of the fifty-fourth resistor R54 is connected to one end of the fifty-fifth resistor R55, and is connected to the sampling voltage input pin 5 of the detection control chip U3; the other end of the thirty-first capacitor C31 and the other end of the fifty-fifth resistor R55 are grounded DGND; the control signal output pin 21 of the detection control chip U3 is connected to the fifty-eighth resistor R58 The other end of the fifty-eighth resistor R58 is connected to one end of the fifty-seventh resistor R57 and the base of the third NPN transistor Q3; the other end of the fifty-seventh resistor R57 and the emitter of the third NPN transistor Q3 are grounded GND; the collector of the third NPN transistor Q3 is connected to the anode of the eleventh diode D11, one end of the thirty-second capacitor C32 and one end of the coil of the switch K1; the cathode of the eleventh diode D11, the other end of the fifty-sixth resistor R56 and the other end of the coil of the switch K1 are connected to the power supply VCC; the normally closed contact of the switch K1 is connected to the second rectifier The positive output end of the detection control chip U3 is connected to the positive output end of the bridge DB2, the normally open contact is connected to one end of the seventeenth capacitor C17, or the normally closed contact of the switch K1 is connected to one end of the seventeenth capacitor C17, and the normally open contact is connected to the positive output end of the second rectifier bridge DB2; the signal sending pin 2 of the detection control chip U3 is connected to the signal receiving pin 3 of the interface chip U5, and the signal receiving pin 1 of the detection control chip U3 is connected to the signal sending pin 2 of the interface chip U5, for communicating with the detection control chip U3; pin 7 of the interface chip U5 is connected to one end of the first TVS diode and the lamp control system, and pin 8 of the interface chip U5 is connected to one end of the second TVS diode and the lamp control system, for communicating with the lamp control system and sending a fault signal to the lamp control system; the other end of the first TVS diode and the other end of the second TVS diode are grounded; pin 4 and pin 6 of the interface chip U5 are grounded GND; pin 1 and pin 9 of the interface chip are connected to the power supply VCC.

[0058] In this embodiment, when the detection control chip U3 detects that the first voltage is greater than or equal to the reference voltage, the pin 21 of the detection control chip U3 does not output a voltage or outputs a low level to the fifty-eighth resistor R58, the coil of the switch K1 is powered off, the normally open contact and the normally closed contact of the switch K1 are disconnected, and the switch K1 is disconnected; when the detection control chip U3 detects that the first voltage is less than the reference voltage, the pin 21 of the detection control chip U3 outputs a high level to the fifty-eighth resistor R58, the coil of the switch K1 is powered on, the normally open contact and the normally closed contact of the switch K1 are attracted, and the switch K1 is turned on.

[0059] In this embodiment, when the detection control chip U3 detects that the first voltage is greater than or equal to the reference voltage, pin 2 of the detection control chip U3 outputs a fault signal to pin 3 of the interface chip U4, and the interface chip U4 sends the fault information to the lighting control system; when the detection control chip U3 detects that the first voltage is less than the reference voltage, pin 21 of the detection control chip U3 outputs a high level to the fifty-eighth resistor R58, the coil of the switch K1 is energized, the normally open contact and the normally closed contact of the switch K1 are attracted, and the switch K1 is turned on.

[0060] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A new type of driving power supply, used to power lamps, characterized by: It includes a main power drive circuit, a secondary power drive circuit and a detection control circuit; the voltage output end of the main power drive circuit is connected to the sampling voltage input end of the detection control circuit; the control signal output end of the detection control circuit is connected to the control signal input end of the secondary power drive circuit; the detection control circuit controls the secondary power drive circuit to be disconnected or turned on by detecting whether the voltage output by the main power drive circuit is normal or abnormal; A switch for controlling the disconnection or conduction of the auxiliary power drive circuit is connected to the auxiliary power drive circuit; the detection control circuit controls the disconnection or closing of the switch; The main power drive circuit includes a first input circuit, a first EMI filter circuit, a first rectifier circuit, a first filter circuit, a first DC-AC conversion circuit, a first rectifier filter circuit and a first output circuit connected in sequence, and the detection control circuit detects the voltage output by the first output circuit; The auxiliary power supply driving circuit includes a second input circuit, a second EMI filtering circuit, a switch, a second rectifying circuit, a second filtering circuit, a second DC-AC conversion circuit, a second rectifying filtering circuit, and a second output circuit connected in sequence, and the detection control circuit controls the switch to be opened or closed; The output power of the auxiliary power driving circuit is less than the normal output power of the main power driving circuit.

2. The new driving power supply according to claim 1 is characterized in that: The detection control circuit includes a voltage sampling circuit, a reference voltage generating circuit, an integrated IC and a switch driving circuit; the input end of the voltage sampling circuit is connected to the output end of the main power driving circuit, and the output end is connected to a voltage input end of the integrated IC; the output end of the reference voltage generating circuit is connected to another voltage input end of the integrated IC; the integrated IC compares the voltage output by the voltage sampling circuit with the reference voltage output by the reference voltage generating circuit, and outputs a control signal to the switch driving circuit; The switch driving circuit controls the switch to be opened or closed.

3. The new driving power supply according to claim 2 is characterized in that: The integrated IC includes a detection control chip, the model of which is STC8A4K16S2A12. And / or, the voltage sampling circuit includes a fifty-fourth resistor, a fifty-fifth resistor and a thirty-first capacitor, one end of the fifty-fourth resistor and one end of the thirty-first capacitor are connected to receive the voltage output by the main power drive circuit, the other end of the fifty-fourth resistor is connected to one end of the fifty-fifth resistor and is connected to the sampling voltage input pin of the integrated IC, and the other end of the thirty-first capacitor and the other end of the fifty-fifth resistor are grounded, And / or, the reference voltage generating circuit includes a fifty-third resistor, a second polarized capacitor and a third precision reference voltage, one end of the fifty-third resistor and the positive electrode of the second polarized capacitor are connected to a power supply, the other end of the fifty-third resistor is connected to a cathode and a control electrode of the third precision reference voltage, and is connected to a reference voltage input pin of an integrated IC, and the negative electrode of the second polarized capacitor and the anode of the third precision reference voltage are grounded, And / or, the switch includes a relay, the switch driving circuit includes a fifty-sixth resistor, a fifty-seventh resistor, a fifty-eighth resistor, a thirty-second capacitor, an eleventh diode and a third NPN-type transistor, the control signal output pin of the integrated IC is connected to one end of the fifty-eighth resistor, the other end of the fifty-eighth resistor is connected to one end of the fifty-seventh resistor and the base of the third NPN-type transistor, the other end of the fifty-seventh resistor and the emitter of the third NPN-type transistor are grounded, the collector of the third NPN-type transistor is connected to the positive electrode of the eleventh diode, one end of the thirty-second capacitor and one end of the coil of the switch, the negative electrode of the eleventh diode, the other end of the fifty-sixth resistor and the other end of the coil of the switch are connected to the power supply, and the normally closed contact and the normally open contact of the switch are connected to the auxiliary power supply driving circuit.

4. The new driving power supply according to claim 2 is characterized in that: The detection control circuit also includes an interface chip; the interface chip is connected to the integrated IC and the lamp control system, and is used to transmit the fault signal output by the integrated IC to the lamp control system.

5. The new driving power supply according to claim 1 is characterized in that: The main power drive circuit also includes a first feedback control loop, which feeds back the voltage output by the main power drive circuit to control the voltage output by the main power drive circuit, and / or the auxiliary power drive circuit also includes a second feedback control loop, which feeds back the voltage output by the auxiliary power drive circuit to control the voltage output by the auxiliary power drive circuit.

6. The new driving power supply according to claim 5 is characterized in that: The first feedback control loop includes a first feedback circuit and a first control circuit, the input end of the first feedback circuit is connected to the output end of the main power drive circuit, the output end is connected to the feedback signal input end of the first control circuit, the control signal output end of the first control circuit is connected to the control signal input end of the main power drive circuit, and / or, the second feedback loop includes a second feedback circuit and a second control circuit, the input end of the second feedback circuit is connected to the output end of the auxiliary power drive circuit, the output end is connected to the feedback signal input end of the second control circuit, and the control signal output end of the second control circuit is connected to the control signal input end of the auxiliary switch drive circuit.

7. The new driving power supply according to claim 6 is characterized in that: The first feedback circuit includes a first sampling circuit, a first comparison circuit and a first feedback output circuit. The input end of the first sampling circuit is connected to the output end of the main power drive circuit, and the output end is connected to the input end of the first comparison circuit. The first comparison circuit compares the voltage sampled by the first sampling circuit with the reference voltage and outputs the comparison result to the first feedback output circuit. The feedback information output end of the first feedback output circuit is connected to the feedback information input end of the first control circuit. And / or, the first feedback circuit includes a second sampling circuit, a second comparison circuit and a second feedback output circuit, the input end of the second sampling circuit is connected to the output end of the auxiliary power supply driving circuit, and the output end is connected to the input end of the second comparison circuit, the second comparison circuit compares the voltage sampled by the second sampling circuit with a reference voltage, and outputs the comparison result to the second feedback output circuit; the feedback information output end of the second feedback output circuit is connected to the feedback information input end of the second control circuit.

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