TWI322559B - Power circuit - Google Patents

Description

1322559 弄月95, IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to n-type switching, and refers to a power supply circuit for electric leakage. [Prior Art].凊 Refer to Figure _, which is a circuit diagram of the conventional power supply ||. As shown, the power supply is used to convert the line voltage VAC to the adjustment voltage Vz. A rectifier circuit 1 〇 ' is consuming the line voltage vAe and rectifying to generate - the input voltage Vin. - Capacitor u, which is light • Connected to the secret 1G and Wei should lose the % and _- remaining I5 to generate the adjustment voltage vz. The -gener diode 16' is coupled to the capacitor 15 and ground for adjustment. A resistor 12 for discharging the capacitance η. This type of electric wire has been widely considered for home devices, for example. With the addition of a compositing machine, a cooling fan and a remote control, the electric detector of this type has the disadvantage of the south power loss, especially in the light load and no load state, the resistor 12 and the genus diode 16 are generated. Significant power supply secret, so in order to save power, it is necessary to reduce power loss. Therefore, this is a high-grade electric service for the above-mentioned _ to reduce power loss under light load and no load conditions, so as to effectively Solve the above problem. • [Invention] The main purpose of this failure is to provide a _ type of crane circuit that can reduce the loss of power and increase the efficiency. The power circuit of the invention comprises an input transistor, the input transistor is a -negative criticality == and a receiving-voltage source; - a first transistor, which is connected in series to the input transistor to provide _; The output of the power circuit; - the input circuit, which is reduced by the Longyuan == pressure level generation - control signal; a second transistor, the remainder is connected to the transmission = according to the control signal thief to lose the power of the crystal - Transistor; _ output gamma, m-channel, supply voltage and do the "electric group domain m money and enable information (1) 2559

And an impedance device coupled to the input transistor and the first transistor to provide a bias voltage to conduct the transistor and the first transistor. The first uniform signal stops the input transistor and the first transistor when the voltage level of the supply voltage is higher than a high output voltage level; and the second enable signal is used to lower the voltage level of the supply voltage to a lower level The output of the power supply circuit is cut off when the output voltage level is output. Further understanding and understanding of the structural features and the efficacies of the present invention will be made by the reviewing committees, and the description of the preferred embodiments and the detailed description will be given below. [Embodiment] Please refer to the second figure, which is a circuit diagram of the power supply of the present invention. As shown, the rectifier circuit 10 is coupled to one of the input terminals of a supply circuit 2 to receive and receive the line voltage VAC to generate an input voltage V!N. The input voltage ViN is a voltage source and is rectified via the rectifier circuit 10. The supply circuit 20 generates a supply voltage Vc at a first output terminal sw, and generates an output voltage Vc at a second output terminal. The ground terminal GND of the supply circuit 20 is coupled to ground. A capacitor 50 is coupled to the first output end sw. In addition, a capacitor 55 is coupled to the second output terminal OUT to maintain energy. The supply circuit 2 can be a power supply circuit, a power supply circuit, a power supply regulation circuit, or a power source circuit. «Month Referring to the second figure, which is a circuit diagram of a preferred embodiment of a supply circuit 2 of a power supply. Supply circuit 20 includes an input transistor 60. The input transistor 6 is coupled to the input terminal to receive the input voltage Vin to provide the supply voltage Vc to the first output terminal sw. The input transistor 60 is a negative critical device such as a junction field effect transistor (JFET). Therefore, the zero bias voltage will turn on the input transistor 60, and the input transistor 6 can only be turned off by a negative bias. The output pre-measure circuit 1GG' is lightly connected to the first output terminal sw for detecting the supply voltage Vc to be at the first enable end of the output detection circuit 1 according to the voltage level of the supply voltage Vc. Generate H energy signal SGV. The impedance device 7 is secreted by the input transistor 6 〇 to provide a bias voltage to the input transistor 60, which turns on the input transistor (6). The impedance device 7〇 can be a resistor or an electron-induced n-signal, turning off the input voltage 6G when the voltage level of the fiber voltage Ve is higher than the high output voltage level. - Low-lobe (LGwDiOp 〇ut, ld〇) Regulator 3GG, which is secreted at the output of 帛2 and produces the output voltage %. In addition, lose 1322559

The year/month correction is performed by the detection circuit 100 to generate a second enable signal Sen according to the voltage level of the supply voltage : (the second enable terminal EN of the output detection circuit 1). The second enable signal Sen is sent to the low dropout regulator 300' to turn off the output voltage V of the supply circuit 20 when the voltage level of the supply voltage vc is lower than a low output voltage level. . The figure is a circuit diagram of a preferred embodiment of the output detection circuit 100. As shown in the figure, the 'signal diodes 110 and 112 are connected in series. The gate diode 112 is further coupled to the first output terminal sw. In order to detect the supply voltage V, the resistor 110 is further coupled to a resistor 115. The resistor is further coupled to a transistor 120. The resistor 115 is used for the voltage level of the supply voltage Vc to be higher than the second pole. The voltages of the bodies 110 and 112 are electrically connected to the transistor 12. A transistor 125 is connected in parallel to the diode 112. When the transistor 120 is turned on, the transistor 125 is short-circuited to the diode 112'. The purpose of hysteresis is reached to detect whether the supply voltage Vc is too high. The voltage of 112 determines the high output voltage level. The voltage of the inductor η〗 determines the hysteresis level of the hysteresis purpose. When the voltage level of the supply voltage Vc is lower than the hysteresis level, the first enable The signal s0v will turn on the input transistor 60. A transistor 140 is coupled to the transistor 12A and the first output terminal Sw. The transistor 14 is turned on according to the conduction state of the transistor 120. A resistor 116 is coupled The first output terminal sw, the transistor 125' 140', further provides a bias voltage to the transistor 125, 140 电阻-resistor 117, which is coupled to the transistor 140 for conducting an electricity when the transistor 12 is turned on. The crystal 129 is further coupled to the transistor 140. In addition, the transistor 129 is further coupled to the input transistor 6〇 to generate when the voltage level of the supply voltage Vc is higher than the high output voltage level. The first coincidence signal Sov is turned off and the input transistor 60 is turned off. The first transistor is connected to the first output terminal sw to extract the supply voltage vc β - a resistor 155 coupled to the second pole. Body 150 and a transistor 165, once the voltage supply voltage Vc is high The low output voltage level conducts the transistor 165. The subsense voltage of the dipole 15 determines the low output voltage level. A resistor 156 is coupled to the first output terminal SW and a transistor. The transistor 170 is further coupled to the first output terminal SW and the transistor 165. The transistor 170 generates the second enable signal SEN when the voltage level of the supply voltage Vc is lower than the low output voltage level. The figure is a circuit diagram of another preferred embodiment of the supply circuit 20. As shown, one of the first transistors 80 of this embodiment is connected in series with the input transistor 60 to provide the supply voltage Vc to the first output. End SW. The first transistor 80 is a positive critical device. The impedance device 7 is coupled to the input transistor 60 and the first transistor 80 to provide a bias voltage to turn on the input transistor 60 and the first transistor 80. When the voltage level of the supply voltage Vc is higher than the high output voltage level, the first enable signal Sov turns off the input transistor 60 and the first transistor 80. The first transistor 80 is used to provide protection to the supply circuit 20. When the supply voltage Vc is shorted, the first transistor 80 will be turned off to protect the input transistor 60. Please refer to the sixth drawing, which is a circuit diagram of another preferred embodiment of the power supply of the present invention. This embodiment is coupled to the turn-on and turn-off lines of one of the supply circuits 30 of the rectifier circuit 10 in synchronization with the line voltage VAC. The supply circuit 30 can be a power supply circuit, a power supply circuit, a power supply adjustment circuit, or a power source circuit. The supply circuit 30 can only be turned on when the input voltage Vjn is lower than an input threshold voltage, which can reduce the switching loss of the input transistor 60 and improve the efficiency of the supply circuit 3. Please refer to the seventh figure, which is a waveform diagram of the input voltage Vrw. When the input voltage VlN is lower than a threshold voltage VT, the power source of the input voltage Vm can be transmitted to the first output terminal sw. The critical voltage VT is related to the input threshold voltage. The supply circuit 30 includes a detection terminal DET coupled to the input voltage γΙΝ via an ink separation circuit 40. The voltage dividing circuit 4 is coupled to the input voltage Vm and the detecting end DET. The voltage dividing circuit 40 includes resistors 41, 42. The resistors 41, 42 are connected in series with each other. See Fig. 8', which is a circuit diagram of a preferred embodiment of the supply circuit 3 of the power supply of Fig. 6. As shown, the supply circuit 3A includes an input transistor (9) which sinks to the input terminal IN to receive the input house Vm to supply the supply voltage Vc at the first output terminal sw. The above input voltage \^ is the source of electricity. An input debt measuring circuit is characterized in that a positive input terminal is connected to the side terminal DET' of the supply circuit 30 to record the input voltage ^ from the voltage dividing circuit (10) side, and is generated according to the input power of the input terminal (4). The control reduces the input transistor 6〇 when the voltage level of the input electric dust is higher than the threshold voltage Vt. The control subtraction is via phase = input_circuit 75 and 歓f crystal green & cut-in input power input fine 1: way 75 includes fine boundary voltage %. The material voltage % is related to the input threshold 1322559 voltage. The critical value of the VT is the secret input circuit of the input circuit of the input circuit, which is connected to the first output terminal SW to measure the supply voltage Vc, and then according to the voltage level of the supply voltage vc. The first enable signal sov is generated at the first enable terminal ov. The circuit of the output detection circuit 100 of this embodiment can be implemented by a circuit of the fourth figure. The impedance device 70 is coupled to the input transistor 6A to provide a bias voltage to turn on the input transistor.

The first enable signal Sov is coupled to the input transistor 60 to turn off the input transistor 6〇 when the voltage level of the supply voltage Vc is at the local voltage level. In addition, the output detection circuit 100 further generates a second enable signal Sen at the second enable terminal EN. The second enable signal is transmitted to the low dropout regulator 300' to turn off the output voltage v of the supply circuit 30 when the voltage level of the supply voltage Vc is lower than the low output voltage level. The low dropout regulator 300 is coupled to the second output terminal OUT〇

Please refer to the ninth drawing, which is a circuit diagram of another preferred embodiment of the supply circuit 30 of the power supply of the sixth diagram. As shown, the supply circuit 30 includes an input transistor 6A coupled to the input terminal IN for receiving an input voltage. A first transistor 80 is coupled in series with the input transistor 邰 to provide the supply voltage Vc to the first output terminal SW. The positive input terminal of the input detection circuit 75' is coupled to the detection terminal DET of the supply circuit 30 to detect the input voltage vm and generate a control signal according to the voltage level of the input voltage %. The input detection circuit 75 includes a threshold voltage ντ coupled to the negative input terminal of the input detection circuit 75. The second transistor 65 is coupled to the input detecting circuit 75, the input transistor 60, and the first transistor 80 to turn off the input transistor 60 and the first transistor 80 according to the control signal. When the voltage level of the input voltage Vin is higher than the threshold voltage, the input transistor 60 and the first transistor 80 will be turned off. The first transistor 80 and the second transistor 65 are positive critical devices. The output detection circuit 100 is coupled to the supply voltage Vc to generate a first enable signal Sov and a second enable signal SEN according to the voltage level of the supply voltage Vc. The impedance device 70 is lightly coupled to the input transistor 60 and the first transistor 80 to provide a bias voltage to conduct the input transistor 6A and the first transistor 80. The first coincidence signal Sov is transmitted to the input transistor 60 and the first transistor 80 to turn off the input transistor 60 and the first transistor 80 when the voltage level of the supply voltage Vc is higher than the high output voltage level. The second enable signal SEN is transmitted to the low dropout regulator 300 to guide

I322S5S year, month and day correction ί·

The output voltage ν〇 of the supply/disconnection circuit 30 is turned on/off. When the voltage level of the supply voltage % is lower than the low output voltage level, the output voltage V 〇 will be cut off. Referring to the tenth figure, it is the circuit block of the low dropout regulator 300 of the present invention. As shown in the figure, "the operational amplifier 31" is a transmission element eiement 320 and the resistors 325, 351, .3. The operational amplifier 310 includes a reference voltage Vref. The reference voltage Vref is coupled to the operational amplifier 31. One of the negative input terminals, the resistor 352, which is connected to one of the operational amplifiers 3(1), is called to send Sen to the operational reference 11 31G' to provide power to the amplifier 31, and the operational amplifier 31 is operated. It is consumed by the operational amplification = 〇, the first output terminal sw and the second output terminal ουτ. Once the second enable signal Sen moon color f operational amplifier 31 〇 and the transmission component 32 〇 are also disabled. Hi, its consumption; the positive input terminal of the operational amplifier 31G, the transmission element 32 () and the second output terminal (8) ^. The resistor 25 is coupled to the transmission element 320, and the transmission element 320 can be a transistor. For - with new chicks, progressive and available for industry, it should be in line with my 2 patent application requirements, and the invention patent application should be filed in accordance with the law. The Prayer Bureau will grant patents as soon as possible. The above is only a better example of the present invention. The examples are not intended to limit the invention. The changes, modifications and modifications of the shape, structure, characteristics and precision of the patent-seeking patents should be included in the scope of this patent application. 1322559

BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a circuit diagram of a conventional power supply; the second figure is a circuit diagram of a preferred embodiment of the power supply of the present invention; the second figure is a supply circuit of the power supply of the present invention. The circuit diagram of a preferred embodiment of the present invention; the fifth diagram is a circuit diagram of a preferred embodiment of the power supply circuit of the present invention; FIG. 6 is a circuit diagram of another preferred embodiment of the power supply of the present invention; FIG. 7 is a waveform diagram of an input voltage of the power supply of the sixth embodiment of the present invention; The circuit of the power supply of the sixth embodiment, the circuit of the preferred embodiment, and the ninth is a circuit diagram of another preferred embodiment of the supply circuit of the power supply of the sixth embodiment of the present invention; and the tenth A circuit diagram of a preferred embodiment of a low dropout regulator of the present invention. [Main component symbol description] 10 Rectifier circuit 11 Capacitor 12 Resistor 15 Capacitor 16 Sense diode 20 Supply circuit 30 Supply circuit 40 Voltage divider circuit 41 Resistor 42 Resistor 50 Capacitor 55 Capacitor 11 1322559 曰 曰 替换 替换 98 98 98. 12. θθ- 60 Input Transistor 65 Second Transistor 70 Impedance Device 75 Input Detection Circuit 80 First Transistor 100 Output Detection Circuit 110 Sense Dipole 112 Sense Dipole 115 Resistor 116 Resistor 117 Resistor 120 Transistor 125 Transistor 129 Transistor 140 Transistor 150 Sense Diode 155 Resistor 156 Resistor 165 Transistor 170 Transistor 300 Low-Dropout Regulator 310 Operational Amplifier 320 Transmitter 325 Resistor 351 Resistor 352 Resistor DET Detecting End ΕΝ The second enabler terminal 1322559 - , . , Vv page change 丨 GND ground terminal IN input terminal Vac line voltage Vc supply voltage vIN input voltage V 〇 output voltage Vref reference voltage Vt threshold voltage Vz adjustment voltage OUT second output terminal ov first Enable end sw first output terminal Sen second enable signal S〇v consistent Signal 13

Claims (1)

曰 替 替 Μ Μ -0-9 - - 10, the scope of application for patents: 1. A power supply circuit, comprising: an input transistor coupled to a voltage source; - a first transistor coupled to the input transistor Providing a supply voltage; - an input detection circuit '13' is connected to the source to generate a control signal according to the verification level of the voltage source; - a second transistor, the input detection circuit, the input transistor And the first transistor 'when the voltage level of the 5H voltage source is higher than a threshold voltage (4), the second transistor turns off the input transistor and the first transistor according to the control signal; an output detection circuit The first supply signal and the second enable signal are coupled to the voltage level of the supply voltage, and an impedance device coupled to the input transistor and the first transistor to Providing a bias voltage to turn on the input transistor and the first transistor; wherein, when the voltage level of the supply voltage is higher than a high output voltage level, the first enable signal turns off the wheeled transistor and the first a transistor, the supply voltage The second actuator output signal can be turned off when the power supply circuit of a low voltage level is lower than the output voltage level. 2. The power supply circuit of claim 2, wherein the input transistor is a negative critical device. 3. The power supply circuit of claim 1, wherein the first transistor and the second transistor are positive interface devices. 4. The power supply circuit of claim 1, wherein the input detection circuit is coupled to the voltage source via a voltage dividing circuit. 5. The power supply circuit of claim 1, wherein the anti-device is a resistor or a transistor. 6. A power supply circuit comprising: - an input transistor "> a secret voltage supply _ supply voltage; An input detection circuit coupled to the voltage source to generate a control signal according to a voltage level of the voltage source; and an impedance device coupled to the input transistor to provide a bias voltage to turn on the input transistor; Wherein 'when the voltage level of the voltage source is higher than a threshold voltage, the control signal turns off the input transistor. The power supply circuit of claim 6, wherein the input transistor is a negative critical device. The power supply circuit of claim 6, wherein the input detection circuit is coupled to the voltage source via a voltage dividing circuit. The power supply circuit of claim 6, wherein the input detection circuit is further coupled to a second transistor, the second transistor is coupled to the input transistor to turn off the input according to the control signal. Transistor. The power supply circuit of claim 6 further includes an output detection circuit coupled to the supply voltage to generate a first enable signal according to a voltage level of the supply voltage. When the voltage level of the supply voltage is higher than a high output voltage level, the first enable signal turns off the input transistor. The power supply circuit of claim 1, wherein the output detection circuit generates a second enable signal according to a voltage level of the supply voltage, and the second enable signal is used for the supply voltage. The output of the power supply circuit is turned off when the voltage level is lower than a low output voltage level. A power supply circuit comprising: an input transistor coupled to a voltage source; a first transistor coupled in series with the input transistor to provide a supply voltage; and an output debt measuring circuit coupled to the supply voltage for The voltage level of the supply voltage generates a first enable signal; and an impedance device is formed in the input transistor and the first transistor to provide a bias voltage to turn on the input transistor and the first transistor Wherein 'When the voltage level of the supply is higher than the _ high output voltage level, the first enable I322559___, . signal cuts off the input transistor and the first transistor. 13. The power supply circuit of claim 12, wherein the input transistor is a negative critical device. 14. The power supply circuit of claim 12, wherein the output detection circuit generates a second enable signal according to the supply voltage winter voltage level, and the second enable signal is used for the supply voltage. The power supply circuit of the power supply circuit of claim 12, wherein the first transistor is a positive critical device. 16. A power supply circuit, comprising: an input transistor coupled to a voltage source to provide a supply voltage; an output detection circuit coupled to the supply voltage to generate a voltage level according to the supply voltage a first uniform energy signal; and an impedance device coupled to the input transistor to provide a bias voltage to turn on the input transistor; wherein 'when the voltage level of the 3H supply voltage is higher than a high output voltage level The first enable signal turns off the turn-in transistor. 17. The power supply circuit of claim 16, wherein the input transistor is a negative critical device. 1S. The power supply circuit of claim 2, wherein the output detection circuit generates a second enable signal according to a voltage level of the supply voltage, and the second enable signal is used in the supply The county's reliance is lower than - low (four) fresh position depends on the output of the supply circuit. 19. A power supply circuit comprising: an input transistor coupled to a voltage source to provide a supply voltage; and an output side circuit for outputting the first enablement of the supply according to the supply f voltage The first enabler of the signal is when the voltage level of the supply voltage is higher than a high output voltage reference signal to the input transistor. 16 years aa If applying for the power circuit described in item 19 of the special fiber, the first female signal turns on the input transistor when the voltage level of the supply voltage is lower than a hysteresis level. For example, the power supply circuit described in Item 19 of the monthly patent range, wherein the output detection circuit is further based on the voltage reduction of the supply voltage - the second _ number, and the voltage level of the supply voltage is spliced The output of the power supply circuit is loaded below a low output voltage level. A power supply circuit comprising: an input transistor receiving a voltage source; a first transistor providing a supply voltage according to the voltage source of the input transistor; an input detection circuit, according to a voltage of the voltage source The first transistor generates a control signal; the first transistor is configured to turn off the input transistor and the first transistor according to the control signal when the voltage level of the voltage source is higher than a threshold voltage; Generating a first enable signal and a second enable signal according to the voltage level of the supply voltage; and providing an impedance device to provide a bias voltage to turn on the input transistor and the first transistor; wherein the supply voltage The first enable is when the voltage level is higher than a high output voltage level. The code turns off the input transistor and the first transistor, and the second enable signal is used to turn on/off the output of the power circuit. a power supply circuit comprising: - an input transistor, providing a supply voltage according to a voltage source; - a wheel detection circuit for generating a control signal according to a voltage level of the voltage source; and - an impedance device providing Biasing and turning on the input transistor; /, medium, when the voltage level of the S Hai voltage source is still at a threshold voltage, the control signal cuts off the input t 曰 Pitfr 日 日 0 - a power supply circuit, which includes: The input transistor 'provides a supply voltage according to a voltage source; and the wheel detection circuit generates a first enable signal according to the voltage level of the supply voltage; wherein the voltage level of the supply voltage is higher than one When the output voltage is high, the first enable signal turns off the input transistor.