CN103166193A - Overheat protection circuit of communication power supply module - Google Patents

Overheat protection circuit of communication power supply module Download PDF

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Publication number
CN103166193A
CN103166193A CN2011104237525A CN201110423752A CN103166193A CN 103166193 A CN103166193 A CN 103166193A CN 2011104237525 A CN2011104237525 A CN 2011104237525A CN 201110423752 A CN201110423752 A CN 201110423752A CN 103166193 A CN103166193 A CN 103166193A
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CN
China
Prior art keywords
circuit
output
input
power supply
resistance
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CN2011104237525A
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Chinese (zh)
Inventor
任炳旭
王有利
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西安恒飞电子科技有限公司
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Priority to CN2011104237525A priority Critical patent/CN103166193A/en
Publication of CN103166193A publication Critical patent/CN103166193A/en

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Abstract

The invention relates to a power supply module, in particular to an overheat protection circuit of a communication power supply module. The overheat protection circuit of the communication power supply module comprises an alternating-current filter 1, a bridge rectifying and filtering circuit 2, a soft start circuit 3, a power conversion circuit 4, a secondary output rectifying and filtering circuit 5 and a pulse width modulation (PWM) control circuit 6. The power conversion circuit 4 comprises an inverter transformer T and a switching adjustment tube V2, wherein the inverter transformer T comprises a first input winding L1, a second input winding L2, a first output winding L3 and a second output winding L4, one end of the second input winding L2 is in electric connection with the switching adjustment tube V2, and a switching adjustment tube 7 is in electric connection with an overheat protection circuit body. The overheat protection circuit body is composed of a triode V2, a divider resistor R13 and a divider resistor R14, wherein the divider resistor R13 and the divider resistor R14 are in series connection between an input end of a protection switching adjusting tube V1 and the ground, the connection point of the divider resistor R13 and the divider resistor R14 is in electric connection with a base electrode of the triode V2, an emitter electrode of the triode V2 is in electric connection with an emitter electrode of the protection switching adjusting tube V1, and a collector electrode of the triode V2 is in electric connection with a collector electrode of the protection switching adjusting tube V1 through a resistor R15.

Description

The overheating protection circuit of power supply module for communication

Technical field

The present invention relates to a kind of power module, relate in particular to a kind of overheating protection circuit of power supply module for communication.

Background technology

Along with the develop rapidly of science and technology, the communications industry and people's relation is day by day close, is bringing into play more and more important effect in people's routine work, life.Any communication equipment all be unable to do without reliable and stable power supply as electric power system, and Switching Power Supply is because having outstanding advantages such as voltage stabilized range is wide, volume is little, efficient is high, easy to use and flexible are widely used in communication equipment gradually.

Many new and high technologies of while are as the development of the power supply correlation techniques such as HF switch technology, soft switch technique, power factor correction technology, synchronous rectification, intellectualized technology, surface mounting technology.Switch power technology is also in constantly innovation, and this also is widely used in for Switching Power Supply the development space that provides larger in communication equipment.Due to the control circuit more complicated of Switching Power Supply, transistor is relative relatively poor with the ability of the anti-electricity of integrated device, thermal shock.And the situations such as Switching Power Supply also often can be subject to the interference of various extraneous factors when work, thereby produces voltage fluctuation, causes, under voltage certainly will cause the output of power supply unstable like this.If the communication equipment long-term work in this environment, can be subject to the damage of very big degree, will bring very big inconvenience to the user.

Summary of the invention

The purpose of this invention is to provide a kind of overheating protection circuit of resisting the power supply module for communication of multiple extraneous factor interference.

The object of the present invention is achieved like this, the overheating protection circuit of power supply module for communication is characterized in that: comprising: ac filter 1, bridge rectifier filter circuit 2, soft starting circuit 3, power conversion circuit 4, secondary output rectifier and filter 5, pwm control circuit 6; Described power conversion circuit 4 comprises contravariant transformer T, switch adjustment pipe V2, contravariant transformer T comprises the first input winding L 1 and the second input winding L 2 and the first output winding L 3 and the second output winding L 4, one end of the second input winding L 2 is electrically connected to switch adjustment pipe V2, switch adjustment pipe V2 is electrically connected to drive circuit 601, the 601 V2 conducting of control switch adjustment pipe and the shut-in times of drive circuit, switch adjustment pipe 7 is electrically connected with overheating protection circuit; Circuit overcurrent protection is comprised of triode V2 and divider resistance R13, R14; resistance R 13 and R14 are serially connected between the input and ground of protection switch adjustment pipe V1; the tie point of resistance R 13 and R14 is electrically connected to triode V2 base stage; the emitter of triode V2 is electrically connected to the emitter of switch adjustment pipe V1, and the collector electrode of triode V2 is electrically connected to the collector electrode of switch adjustment pipe V1 by resistance R 15.

pwm control circuit 6 is by drive circuit 601, sample circuit 602, compare amplifying circuit 603, pulse-width modulation circuit 604, reference circuit 605 consists of, alternating voltage is exported with the input of bridge rectifier filter circuit 2 after ac filter 1 carries out filtering and is electrically connected to, export through bridge rectifier filtering, the output of bridge rectifier filter circuit 2 is electrically connected to power conversion circuit 4 after soft starting circuit 3, the controlled end of power conversion circuit 4 is electrically connected to the control end of pwm control circuit 6, pwm control circuit 6 inputs are electrically connected to secondary output rectifier and filter 5 outputs, sample circuit 602 by pwm control circuit 6 detects output voltage fluctuation signal or output current fluctuation signal, be input to the input of comparison amplifying circuit 603 together with the reference signal of output voltage fluctuation signal or output current fluctuation signal and reference circuit 605, be electrically connected to the control end of pulse-width modulation circuit 604 by the output that compares amplifying circuit 603, control the pulsewidth of pulse-width modulation circuit 604, the pulse width variations signal amplifies 4 burning voltage fluctuation or the current fluctuations of power ratio control translation circuit through drive circuit 601, between the input of bridge rectifier filter circuit 2 and pwm control circuit 6, the input overvoltage is arranged, under voltage protection circuit 12.

the input of the input of described input overvoltage, under voltage protection circuit 12 and ac filter 1 output or bridge rectifier filter circuit 2, sampling voltage is divided into two-way, one the tunnel through R1, R2 dividing potential drop, the tie point of R1 and R2 is through capacitor C 1 over the ground after filtering, is input to in-phase end 3 pin of the first comparator after by R3, R4 dividing potential drop, another road is through R7, the R8 dividing potential drop, the tie point of R7 and R8 is through capacitor C 2 over the ground after filtering, passing through R9, be input to out-phase end 6 pin of the second comparator after the R10 dividing potential drop, by resistance R 5, R6, R11, R12 consists of bridge circuit, resistance R 5 with connect negative terminal after R11 is connected, pin reference voltage after resistance R 6 is connected with R12, out-phase end 2 pin of resistance R 5 and resistance R 6 another termination the first comparators, in-phase end 5 pin of resistance R 11 and resistance R 12 another termination the second comparators, the first comparator and the second comparator output terminal are electrically connected to pulse-width modulation circuit 604 inputs of pwm control circuit 6 by two diode forward conductings respectively later, lower than 5 pin reference voltages, 7 pin output high level of the second comparator remove to control pwm control circuit 6 and turn-off, the power supply no-output as sampling voltage, higher than 2 pin reference voltages, 1 pin output high level of the first comparator removes to control pwm control circuit 6 makes its shutoff, the power supply no-output as sampling voltage.

Described secondary output rectifier and filter 5 comprises that fly-wheel diode, energy storage inductor and filter capacitor form.

Described soft start protective circuit 3 comprises current-limiting resistance R16 and capacitor C3, current-limiting resistance R16 be connected with capacitor C3 tie point and power conversion circuit the first input winding L 1 and be connected the connecting of input winding L 2, the current-limiting resistance R16 other end is electrically connected to the output of bridge rectifier filter circuit, and capacitor C3 is electrically connected to power supply negative terminal; When power connection moment, soft start protective circuit 3 is started working, and to capacitor C3 charging, during due to start, the voltage of C3 is zero to input voltage, cisco unity malfunction during the inverter start, the surge current that produces during the restriction start through rectifier bridge U and current-limiting resistance R16; When capacitor C3 was charged to approximately 80% rated voltage, the inverter normal operation produced the triggering signal of thyristor V1 through the auxiliary winding of main transformer, make thyristor conducting and short circuit current limitation resistance R 16, and Switching Power Supply is in normal operating condition.

The first comparator and the second comparator are LM2904.

Switch adjustment pipe 7 is fixed on housing 8 with radiating groove, and high power switch adjustment pipe 7 insulate with housing 8 with radiating groove Shang Xia 10 by heat conductive insulating pad 9 and insulating bushing.

Advantage of the present invention is: owing to adopting the effectively normal operation of protection power source self and load of multiple safety protective circuit, have higher functional reliability, can reduce the power consumption equipment maintenance cost, further reduce the overall cost of operation of communication system.

Description of drawings

The present invention is described in detail below in conjunction with the drawings and specific embodiments:

Fig. 1 is the main circuit structure block diagram of power supply of the present invention;

Fig. 2 is the circuit theory diagrams of Fig. 1;

Fig. 3 is the schematic diagram of input overvoltage, under voltage protection circuit;

Fig. 4 is the schematic diagram of input circuit overcurrent protection;

Fig. 5 is the schematic diagram of overheating protection circuit;

Fig. 6 is high power switch adjustment pipe radiator structure schematic diagram vertical view;

Fig. 7 is high power switch adjustment pipe radiator structure schematic diagram front view.

In figure, 1, ac filter; 2, bridge rectifier filter circuit; 3, soft starting circuit; 4, power conversion circuit; 5, secondary output rectifier and filter; 6, pwm control circuit; 7, switch adjustment pipe; 8, with the housing of radiating groove; 9, heat conductive insulating pad; 10, insulating bushing; 11, screw; 12, input overvoltage, under voltage protection circuit.

Embodiment

referring to illustrated in figures 1 and 2, the overheating protection circuit of power supply module for communication comprises: ac filter 1, bridge rectifier filter circuit 2, soft starting circuit 3, power conversion circuit 4, secondary output rectifier and filter 5, pwm control circuit 6, pwm control circuit 6 is by drive circuit 601, sample circuit 602, compare amplifying circuit 603, pulse-width modulation circuit 604, reference circuit 605 consists of, alternating voltage is exported with the input of bridge rectifier filter circuit 2 after ac filter 1 carries out filtering and is electrically connected to, export through bridge rectifier filtering, the output of bridge rectifier filter circuit 2 is electrically connected to power conversion circuit 4 after soft starting circuit 3, the controlled end of power conversion circuit 4 is electrically connected to the control end of pwm control circuit 6, pwm control circuit 6 inputs are electrically connected to secondary output rectifier and filter 5 outputs, sample circuit 602 by pwm control circuit 6 detects output voltage fluctuation signal or output current fluctuation signal, be input to the input of comparison amplifying circuit 603 together with the reference signal of output voltage fluctuation signal or output current fluctuation signal and reference circuit 605, be electrically connected to the control end of pulse-width modulation circuit 604 by the output that compares amplifying circuit 603, control the pulsewidth of pulse-width modulation circuit 604, the pulse width variations signal amplifies 4 burning voltage fluctuation or the current fluctuations of power ratio control translation circuit through drive circuit 601, between the input of bridge rectifier filter circuit 2 and pwm control circuit 6, the input overvoltage is arranged, under voltage protection circuit 12.

Secondary output rectifier and filter 5 comprises that fly-wheel diode, energy storage inductor and filter capacitor form.

Shown in Figure 2, power conversion circuit 4 comprises contravariant transformer T, switch adjustment pipe V2, contravariant transformer T comprises the first input winding L 1 and the second input winding L 2 and the first output winding L 3 and the second output winding L 4, one end of the second input winding L 2 is electrically connected to switch adjustment pipe V2, switch adjustment pipe V2 is electrically connected to drive circuit 601, the 601 V2 conducting of control switch adjustment pipe and the shut-in times of drive circuit, the circuit more complicated of Switching Power Supply generally is connected to the input filter of small inductor, large electric capacity at the input of Switching Power Supply.At booting moment, filtering capacitor can flow through very large surge current, and this surge current can be the several times of normal input current.Large like this surge current can make the contact of common power switch or the contact fusing of relay, and makes the input blown fuse.In addition, surge current also can damage capacitor, makes it the lost of life, damages too early.For this reason, use soft start protective circuit 3 in this power supply.

Soft start protective circuit 3 is made of current-limiting resistance R16 and capacitor C3, current-limiting resistance R16 be connected with capacitor C3 tie point and power conversion circuit the first input winding L 1 and be connected the connecting of input winding L 2, the current-limiting resistance R16 other end is electrically connected to the output of bridge rectifier filter circuit, and capacitor C3 is electrically connected to power supply negative terminal; When power connection moment, soft start protective circuit 3 is started working, and input voltage charges to capacitor C3 through rectifier bridge U and current-limiting resistance R16, during due to start, the voltage of C3 is zero, therefore, cisco unity malfunction during the inverter start, the surge current that has produced when namely having limited start; When capacitor C3 is charged to approximately 80% rated voltage, the inverter normal operation.Produce the triggering signal of thyristor V1 through the auxiliary winding of main transformer, make thyristor conducting and short circuit current limitation resistance R 16, Switching Power Supply is in normal operating condition.Therefore, select suitable capacitor C 3, the surge current that produces in the time of just preventing from starting shooting.

As shown in Figure 3; input overvoltage, the input of under voltage protection circuit 12 and the input of ac filter 1 output or bridge rectifier filter circuit 2; sampling voltage is divided into two-way; one the tunnel through R1, R2 dividing potential drop; the tie point of R1 and R2 is through capacitor C 1 over the ground after filtering, is input to in-phase end 3 pin of the first comparator after by R3, R4 dividing potential drop.another road is through R7, the R8 dividing potential drop, the tie point of R7 and R8 is through capacitor C 2 over the ground after filtering, passing through R9, be input to out-phase end 6 pin of the second comparator after the R10 dividing potential drop, by resistance R 5, R6, R11, R12 consists of bridge circuit, resistance R 5 with connect negative terminal after R11 is connected, pin reference voltage after resistance R 6 is connected with R12, out-phase end 2 pin of resistance R 5 and resistance R 6 another termination the first comparators, in-phase end 5 pin of resistance R 11 and resistance R 12 another termination the second comparators, the first comparator and the second comparator output terminal are electrically connected to pulse-width modulation circuit 604 inputs of pwm control circuit 6 by two diode forward conductings respectively later.Lower than 5 pin reference voltages, 7 pin output high level of the second comparator remove to control pwm control circuit 6 and turn-off, the power supply no-output as sampling voltage.Thereby protection switch is adjusted Guan Buhui and is damaged because input voltage is too high or too low.Higher than 2 pin reference voltages, 1 pin output high level of the first comparator removes to control pwm control circuit 6 makes its shutoff, the power supply no-output as sampling voltage.The first comparator and the second comparator are LM2904.

Shown in Figure 4, for protection switch adjustment pipe 7 is not burnt when increasing at short circuit, electric current, adopted circuit overcurrent protection.Circuit overcurrent protection is comprised of triode V2 and divider resistance R13, R14.Resistance R 13 and R14 are serially connected between the input and ground of protection switch adjustment pipe V1; the tie point of resistance R 13 and R14 is electrically connected to triode V2 base stage; the emitter of triode V2 is electrically connected to the emitter of switch adjustment pipe V1, and the collector electrode of triode V2 is electrically connected to the collector electrode of switch adjustment pipe V1 by resistance R 15.

During the circuit normal operation, by the dividing potential drop effect of R13 and R14, make the base potential of V2 lower than emitter current potential, emitter junction bears reverse voltage.So V2 is in cut-off state (being equivalent to open circuit), on not impact of voltage stabilizing circuit.When output voltage is zero, the emitter of V2 is equivalent to ground connection, and V2 is in saturation conduction state (being equivalent to short circuit), thereby makes switch adjustment pipe V1 base stage and emitter be bordering on short circuit, and is in cut-off state, cuts off circuital current, thereby reaches the protection purpose.Its basic skills of circuit overcurrent protection is that when output current surpassed a certain value, switch was adjusted pipe and is in reverse-bias state, thereby ends the automatic shutdown circuit electric current.

Shown in Figure 5, highly integrated and the light weight small size of switching regulator in Switching Power Supply, power density in its unit volume is improved greatly, if therefore the components and parts of supply unit inside do not have corresponding raising to the requirement of its operating ambient temperature, circuit performance is degenerated, the components and parts premature failure.The maximum tube shell temperature that general high power switch adjustment pipe allows is 75 ℃, and simultaneous temperature is the most important factor that affects the power-supply device reliability.The analysis showed that 2 ℃ of the every risings of electronic devices and components temperature according to interrelated data; reliability decrease 10%; when the working life during 50 ℃ of temperature rises only has 25 ℃ of temperature rises 1/6 caused damage for fear of power device is overheated, therefore is provided with overheating protection circuit in power module circuitry of the present invention.

Overheating protection circuit comprises: capacitor C, resistance R r and hot thyristor TT201 are connected on after capacitor C, resistance R r parallel connection between the positive electrode and control electrode of hot thyristor TT201.Hot thyristor TT201 positive electrode connects switch adjustment pipe base stage, and the negative electrode of hot thyristor TT201 connects switch adjustment pipe emitter, according to the characteristic of hot thyristor, is determined the conducting temperature of this device by the Rr value, and Rr is larger, and the conducting temperature is lower.When it being placed near switch adjustment pipe, or in supply unit the time, switch is adjusted the base current of pipe by the hot thyristor TT201 of n control gate type bypass, and collector current is cut off in the switching tube cut-off, and it is overheated to prevent.

Referring to Fig. 6 and shown in Figure 7, the maximum tube shell temperature that allows due to high power switch adjustment pipe 7 is 75 ℃, cause damage for fear of power device is overheated, high power switch adjustment pipe 7 is fixed on housing 8 with radiating groove, high power switch adjustment pipe 7 insulate with housing 8 with radiating groove Shang Xia 10 by heat conductive insulating pad 9 and insulating bushing, and hold-down screw 11 adopts M3 * 20.Because housing 8 radiating surfaces with radiating groove are large, do not affect overall volume, make high power switch adjustment pipe 7 maximum tube shell temperature be significantly less than 75 ℃.

Power supply module for communication of the present invention is also supported reserve lead acid accumulator function, and the reserve lead acid accumulator when the civil power normal power supply, does not need storage battery power supply from the access of main circuit 28V port.When interruption suddenly in civil power normal power supply process or the protection of power supply overvoltage/undervoltage, can automatically switch to the lead acid accumulator power supply, guarantee the power supply normal operation.The alarm of the high level of Input Online signal output simultaneously.

Above overheating protection circuit to power supply module for communication of the present invention has been described in detail.In the situation that do not deviate from various apparent change that the spirit of technical scheme of the present invention and claim scope carry out it all within protection scope of the present invention.

The present invention be directed to communication equipment to the requirement of supply module high security and high reliability, and the overheating protection circuit of the power supply module for communication of design.This power supply module for communication can be worked in adverse circumstances and catastrophic failure situation safely and reliably, reduces the daily running cost of common carrier.

Claims (7)

1. the overheating protection circuit of power supply module for communication, is characterized in that: comprising: ac filter 1, bridge rectifier filter circuit 2, soft starting circuit 3, power conversion circuit 4, secondary output rectifier and filter 5, pwm control circuit 6; Described power conversion circuit 4 comprises contravariant transformer T, switch adjustment pipe V2, contravariant transformer T comprises the first input winding L 1 and the second input winding L 2 and the first output winding L 3 and the second output winding L 4, one end of the second input winding L 2 is electrically connected to switch adjustment pipe V2, switch adjustment pipe V2 is electrically connected to drive circuit 601, the 601 V2 conducting of control switch adjustment pipe and the shut-in times of drive circuit, switch adjustment pipe 7 is electrically connected with overheating protection circuit; Circuit overcurrent protection is comprised of triode V2 and divider resistance R13, R14; resistance R 13 and R14 are serially connected between the input and ground of protection switch adjustment pipe V1; the tie point of resistance R 13 and R14 is electrically connected to triode V2 base stage; the emitter of triode V2 is electrically connected to the emitter of switch adjustment pipe V1, and the collector electrode of triode V2 is electrically connected to the collector electrode of switch adjustment pipe V1 by resistance R 15.
2. the overheating protection circuit of power supply module for communication according to claim 1, it is characterized in that: pwm control circuit 6 is by drive circuit 601, sample circuit 602, compare amplifying circuit 603, pulse-width modulation circuit 604, reference circuit 605 consists of, alternating voltage is exported with the input of bridge rectifier filter circuit 2 after ac filter 1 carries out filtering and is electrically connected to, export through bridge rectifier filtering, the output of bridge rectifier filter circuit 2 is electrically connected to power conversion circuit 4 after soft starting circuit 3, the controlled end of power conversion circuit 4 is electrically connected to the control end of pwm control circuit 6, pwm control circuit 6 inputs are electrically connected to secondary output rectifier and filter 5 outputs, sample circuit 602 by pwm control circuit 6 detects output voltage fluctuation signal or output current fluctuation signal, be input to the input of comparison amplifying circuit 603 together with the reference signal of output voltage fluctuation signal or output current fluctuation signal and reference circuit 605, be electrically connected to the control end of pulse-width modulation circuit 604 by the output that compares amplifying circuit 603, control the pulsewidth of pulse-width modulation circuit 604, the pulse width variations signal amplifies 4 burning voltage fluctuation or the current fluctuations of power ratio control translation circuit through drive circuit 601, between the input of bridge rectifier filter circuit 2 and pwm control circuit 6, the input overvoltage is arranged, under voltage protection circuit 12.
3. the overheating protection circuit of power supply module for communication according to claim 2, it is characterized in that: the input of the input of described input overvoltage, under voltage protection circuit 12 and ac filter 1 output or bridge rectifier filter circuit 2, sampling voltage is divided into two-way, one the tunnel through R1, R2 dividing potential drop, the tie point of R1 and R2 is through capacitor C 1 over the ground after filtering, is input to in-phase end 3 pin of the first comparator after by R3, R4 dividing potential drop, another road is through R7, the R8 dividing potential drop, the tie point of R7 and R8 is through capacitor C 2 over the ground after filtering, passing through R9, be input to out-phase end 6 pin of the second comparator after the R10 dividing potential drop, by resistance R 5, R6, R11, R12 consists of bridge circuit, resistance R 5 with connect negative terminal after R11 is connected, pin reference voltage after resistance R 6 is connected with R12, out-phase end 2 pin of resistance R 5 and resistance R 6 another termination the first comparators, in-phase end 5 pin of resistance R 11 and resistance R 12 another termination the second comparators, the first comparator and the second comparator output terminal are electrically connected to pulse-width modulation circuit 604 inputs of pwm control circuit 6 by two diode forward conductings respectively later, lower than 5 pin reference voltages, 7 pin output high level of the second comparator remove to control pwm control circuit 6 and turn-off, the power supply no-output as sampling voltage, higher than 2 pin reference voltages, 1 pin output high level of the first comparator removes to control pwm control circuit 6 makes its shutoff, the power supply no-output as sampling voltage.
4. the overheating protection circuit of power supply module for communication according to claim 1 is characterized in that: described secondary output rectifier and filter 5 comprises that fly-wheel diode, energy storage inductor and filter capacitor form.
5. the overheating protection circuit of power supply module for communication according to claim 1, it is characterized in that: described soft start protective circuit 3 comprises current-limiting resistance R16 and capacitor C3, current-limiting resistance R16 be connected with capacitor C3 tie point and power conversion circuit the first input winding L 1 and be connected the connecting of input winding L 2, the current-limiting resistance R16 other end is electrically connected to the output of bridge rectifier filter circuit, and capacitor C3 is electrically connected to power supply negative terminal; When power connection moment, soft start protective circuit 3 is started working, and to capacitor C3 charging, during due to start, the voltage of C3 is zero to input voltage, cisco unity malfunction during the inverter start, the surge current that produces during the restriction start through rectifier bridge U and current-limiting resistance R16; When capacitor C3 was charged to approximately 80% rated voltage, the inverter normal operation produced the triggering signal of thyristor V1 through the auxiliary winding of main transformer, make thyristor conducting and short circuit current limitation resistance R 16, and Switching Power Supply is in normal operating condition.
6. the overheating protection circuit of power supply module for communication according to claim 3, it is characterized in that: the first comparator and the second comparator are LM2904.
7. the overheating protection circuit of power supply module for communication according to claim 1; it is characterized in that: switch adjustment pipe 7 is fixed on housing 8 with radiating groove, and high power switch adjustment pipe 7 insulate with housing 8 with radiating groove Shang Xia 10 by heat conductive insulating pad 9 and insulating bushing.
CN2011104237525A 2011-12-17 2011-12-17 Overheat protection circuit of communication power supply module CN103166193A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106611945A (en) * 2015-10-21 2017-05-03 天地融科技股份有限公司 Line protection circuit and communication device
CN111404404A (en) * 2020-04-24 2020-07-10 深圳市海洋王照明工程有限公司 Switching power supply circuit and L ED lamp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040032754A1 (en) * 2002-08-19 2004-02-19 Jian Yang Multiple output power supply having soft start protection for load over-current or short circuit conditions
CN201601535U (en) * 2009-11-23 2010-10-06 南昌百特生物高新技术股份有限公司 Lithium-battery power supply circuit of blood analyzer
CN201656760U (en) * 2010-03-22 2010-11-24 临沂施乃通电气技术有限公司 Surge-prevention soft starting circuit
CN201877790U (en) * 2010-09-30 2011-06-22 上海良信电器股份有限公司 Circuit with functions of two-polar leakage protection and overvoltage/undervoltage protection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040032754A1 (en) * 2002-08-19 2004-02-19 Jian Yang Multiple output power supply having soft start protection for load over-current or short circuit conditions
CN201601535U (en) * 2009-11-23 2010-10-06 南昌百特生物高新技术股份有限公司 Lithium-battery power supply circuit of blood analyzer
CN201656760U (en) * 2010-03-22 2010-11-24 临沂施乃通电气技术有限公司 Surge-prevention soft starting circuit
CN201877790U (en) * 2010-09-30 2011-06-22 上海良信电器股份有限公司 Circuit with functions of two-polar leakage protection and overvoltage/undervoltage protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106611945A (en) * 2015-10-21 2017-05-03 天地融科技股份有限公司 Line protection circuit and communication device
CN111404404A (en) * 2020-04-24 2020-07-10 深圳市海洋王照明工程有限公司 Switching power supply circuit and L ED lamp

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Application publication date: 20130619