WO2012139415A1 - Dc voltage-stabilized power supply - Google Patents

Abstract

A direct-current (DC) voltage-stabilized power supply is provided. The power supply receives an input alternating-current mains supply (Us) via a fuse (R_S1) and a sampling resistor (R₁₁), and obtains a drain electrode (D) voltage of a field effect transistor (FET) via a rectifier bridge (DB₁₁), a voltage-stabilized capacitor (C₁₁)and a voltage-stabilized diode (DW₁). The sampling resistor (R₁₁) and the voltage-stabilized capacitor (C₁₁) can ensure that the minimum value of the voltage between the FET drain electrode (D) and the FET source electrode(S) is greater than the absolute value of the pinch off voltage Vp. By directly connecting the grid electrode (G) with the source electrode (S), the FET is operated in the constant-current area making use of the characteristics of the N-channel junction FET. A predetermined stabilized constant DC voltage can be obtained by connecting the source electrode (S) of the FET to another voltage-stabilized capacitor (C₁₂). The voltage-stabilized diode (DW₁) in parallel connected with the FET can be switched on before the voltage which the FET sustains is greater than or equal with the breakdown voltage to avoid the damage of the FET. The voltage-stabilized capacitor (C₁₂) at an output terminal is not necessary if the voltage stabilizing demand is not high. A variable resistor (R_L1) can be connected with the FET source electrode (S) to obtain a regulated DC voltage. When multiple output voltages are needed, several sampling resistors (R₁₂, R₁₃) connected in series or in parallel can be used to obtain multiple output voltages. Based on the same principle, other types of FET can be applied with proper adjustments. With simple construction, good rectification effect and less heat loss, the power supply can meet the requirement of a precise instrument.

Description

 Description

 ^ ^ A DC regulated power supply : Technical field

 The invention relates to a DC stabilized power supply. Background technique

 At present, there are many real-time power supply, large equipment, computer TV, small charger, common circuit complexity, high cost, and poor voltage regulation. Summary of the invention

 The object of the present invention is to provide a DC voltage regulator source, which is simple in circuit, utilizes the characteristics of an N-channel junction field effect transistor, samples an input AC mains through a fuse and a sampling resistor, and rectifies through a rectifier bridge. Then, through a voltage regulator capacitor (this capacitor can be connected in series with the rectifier bridge) and a Zener diode to obtain a drain voltage, this voltage ensures that the minimum value of the drain-source voltage Uds is too high for the pinch-off voltage Vp. Value, gate G is connected to source S, that is, Ugs is equal to zero. The FET operates in the constant current region, and is regulated by a Zener capacitor from the source to obtain a preset DC voltage with a stable straight line. The Zener diode connected in parallel with the FET is opened before the FET encounters a breakdown voltage greater than or equal to the breakdown voltage to prevent the FET from burning out. The sampling resistor and the voltage regulator capacitor at the input terminal can ensure the drain voltage. The minimum value is greater than the absolute value of the clamp terminal voltage, and the Zener diode can ensure that the D drain voltage of the sample is such that the drain-source voltage of the FET is greater than or equal to the breakdown voltage. Normal operation, the maximum drain voltage is controlled within the voltage regulator of the I-voltage diode. The Zener diode can also be connected to the drain and the source to reduce the requirement of the Zener diode. » The sampling resistor and the voltage regulator capacitor ensure leakage. The source voltage is lower than the breakdown voltage, which is higher than the absolute value of the pinch-off voltage. The voltage regulator must be at the output of the capacitor when the voltage is high. Add a capacitor after the source. The variable resistor can be used to obtain the adjustable straight voltage. When multiple voltages are required, several sampling resistors can be connected in series or in parallel at the output, so that multiple voltages can be output. Other FETs can also be used. The principle is similar. Only a little adjustment; the circuit is simple in structure, good in rectification effect, less heat loss, and grindable; & precision instrument requirements.

 For example, the DC voltage regulator circuit can sample a voltage from the input AC mains with a fuse and a sampling resistor and rectify it through the rectifier bridge. It can be stabilized by a voltage regulator capacitor (the regulator capacitor can be connected in series with the rectifier bridge). On the voltage diode, there is a sampling resistor and a voltage stabilizing capacitor to ensure that the minimum value of the voltage wave applied to the Zener diode is greater than or equal to the voltage regulator of the stable S diode; and then through a voltage regulator capacitor (also not required) It can output a stable DC voltage, and a variable resistor can be added to the output to obtain an adjustable voltage. When multiple voltage outputs are required, only a few sampling resistors can be connected in series or in parallel.

 Both of the above circuits can replace the rectifier bridge with a diode half-wave rectification, and the effect is just as good.

 Relative to the above two cases, for circuits with low rectification requirements, only one fuse and sampling resistor are used to sample a voltage from the input AC mains through a diode half-wave rectification, and an output capacitor can be used to obtain a general DC voltage. ; Several sampling resistors can be connected in series and in parallel to obtain multiple output voltages; a variable resistor can be added to the output to obtain an adjustable voltage.

The above-mentioned several circuits are used as chargers. For components that need only set one switching circuit and need to dissipate heat, simply enlarge the copper of the printed circuit board or place the metal piece in a place where heat is dissipated to save the fan; The sampling resistors can be placed behind the rectifier bridge, only to improve the requirements of the rectifier bridge; the circuit does not require a transformer, the circuit is simple and low cost, and is widely applicable to each Description

A circuit that needs to be rectified; the above examples can be used to make separate power supplies, chargers, etc., such as mobile phone chargers, computer TVs, and various equipments; because of its simple structure, it can be integrated into various circuits that need to be rectified or Directly produced on a variety of equipment and instruments, can also be made into blocks, such as computer TVs and other motherboards, so that less separate power supply, especially portable computers, such as portable, easy to damage.

 The invention has the advantages of simple structure, good rectification and voltage regulation effect, and the first example can meet the requirements of the precision instrument. The cost is low, the heat loss is small, the phoenix fan can be omitted, and the promotion value is extremely popular. DRAWINGS

 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of the circuit principle of the present invention.

 Figure 2 is a schematic diagram of the circuit principle when a Zener diode is used.

 Figure 3 is a schematic diagram of the simplest DC voltage circuit. detailed description

 Referring to Figure 1, Figure 2, Figure 3, the present invention is a DC stabilized power supply. The power supply circuit is simple, and the characteristics of the N-channel junction field effect transistor are used to input the AC through a fuse Rsl and a sampling resistor R11. The electric Us is sampled, and then rectified by a rectifier bridge DB11, and then passed through a voltage stabilizing capacitor C11 (this capacitor is connected in series with the rectifier bridge) and the Zener diode DW1 to obtain a D drain voltage, which makes the FET leak. The minimum value of the source voltage is greater than the absolute value of the pinch-off voltage Vp, the gate G is shorted to the source S, and the effect tube operates in the constant current region, and is regulated from the source S through a Zener capacitor C12. A preset DC voltage is the same as the steady line, and the Zener diode DW1 is connected in parallel with the FET. The drain voltage of the FET is in the range of greater than or equal to the breakdown voltage. In order to prevent the FET from being burnt out, the sampling resistor R11 at the input terminal and the voltage regulator capacitor C11 ensure that the minimum value of the drain-source voltage Uds is greater than the absolute value of the clip-end voltage Vp, and the Zener diode DW1 can ensure The sampled D drain voltage works normally when the drain-source voltage is greater than or equal to the breakdown voltage, so that the maximum drain D voltage is controlled within the regulated voltage regulator of the Zener diode DW1; the Zener diode can also be connected in parallel On the drain and the source, to reduce the requirements of the Zener diode; also do not use the Zener diode, the sampling resistor and the voltage regulator capacitor ensure that the drain-source voltage is lower than the breakdown voltage, higher than the absolute value of the pinch-off voltage; When not high, the capacitor C12 at the output terminal can be omitted. After the source S, a variable resistor RL1 can be added to obtain an adjustable DC voltage. When multiple voltage outputs are required, several sampling resistors can be connected in series or in parallel at the output. R12, R13; can output multiple voltages U11, U12, U13; Other field effect transistors can also be used, the principle is similar, R needs a little adjustment; The circuit is simple in structure, good in rectification effect, less heat loss, can meet the precision Instrument requirements.

 For the DC voltage regulator circuit as described above, a voltage can be sampled from the input AC mains by a fuse Rs2 and a sampling resistor R21, and then rectified through a rectifier bridge DB21 through a voltage regulator capacitor C21 (this regulator capacitor can be connected in series with the rectifier bridge in series). The force B is on the Zener diode DW2, and the sampling resistor R21 and the voltage stabilizing capacitor C21 ensure that the minimum value of the voltage wave applied to the Zener diode DW2 is equal to or greater than the voltage regulator of the Zener diode DW2; Capacitor C22 (also not required) can output a stable DC voltage, and a variable resistor RL2 can be added to the output to obtain an adjustable voltage. When multiple voltage outputs are required, only a few samples in series or in parallel are required. Resistors R23, R24, and R22 can obtain multiple voltages of U20, U21, U22, and U23.

 Both of the above two methods can replace the rectifier bridge DB11 DB21 with a diode half-wave rectification, and the effect is just as good.

In contrast, for circuits with low rectification requirements, only one fuse Rs3 and sampling resistor R31 are used to take a voltage from the input AC mains Us via a diode Dz half-wave rectification, and an output capacitor C31 can be used to obtain an effect. Description

The general DC voltage U31; several sampling resistors can be connected in series and parallel to obtain multiple output voltages; an adjustable voltage can be obtained by adding a variable resistor RL3 to the output.

 There are several cases in which the circuit needs to dissipate heat. Simply add the copper of the printed circuit board or connect the metal piece to a place where heat is dissipated to save the fan. The input sampling resistors can be placed behind the rectifier bridge, only Improve the requirements of the rectifier bridge; the circuit does not need a transformer, the circuit is simple and low cost, and is widely applicable to various circuits that need to be rectified; the above L case can be made into a separate power source, charger, etc., such as mobile phone charger, computer TV And the power supply of various equipments and instruments; Because of its simple structure, it can be integrated into various circuits that need to be rectified, or it can be made into an integrated block, such as a computer TV, etc., so that less individual power supplies, especially portable computers, etc. Convenient and not easily damaged.

 The invention has the advantages of simple structure, good rectification and voltage regulation, and good freezing. Example 1 can meet the requirements of precision instruments. * Low cost; less heat loss, can save the fan > 'very popular value.

Claims

Claim  1. A DC stabilized power supply, characterized in that the power supply circuit is simple, and the characteristics of the N-channel junction field effect transistor are utilized, and the input AC mains is sampled by a fuse and a singular resistor, and then rectified by a rectifier bridge. Then, a D-drain voltage is obtained through a voltage stabilizing capacitor (the capacitor is connected in series with the rectifier bridge) and the Zener diode, and the voltage ensures that the minimum value of the drain-source voltage Uds is greater than the absolute value of the pinch-off voltage Vp. The pole G is connected to the source S, that is, Ugs is equal to zero, and the FET operates in the constant current region, and is regulated by a Zener capacitor from the source, thereby obtaining a preset DC voltage of a relatively stable straight line, and the field The Zener diode connected in parallel with the effect tube is opened before the FET encounters a breakdown voltage greater than or equal to the breakdown voltage to prevent the FET from being burned out. The sampling resistor and the voltage regulator capacitor at the input terminal can ensure the minimum drain voltage. More than the absolute value of the clamp terminal voltage, the Zener diode can ensure that the D drain voltage of the sample is normalized when the drain-source voltage of the FET is greater than or equal to the breakdown voltage. The maximum value of the drain voltage is controlled within the voltage regulator diode. The Zener diode can also be connected to the drain and the source to reduce the requirement of the Zener diode. The resistor and the voltage stabilizing capacitor ensure that the drain-source voltage is lower than the breakdown voltage and higher than the absolute value of the pinch-off voltage. When the voltage regulation requirement is not high, the capacitor at the output terminal may not be used; after the source, a variable resistor may be added. The adjustable DC voltage can be obtained; when multiple voltage output is required, several sampling resistors can be connected in series or in parallel at the output end to output multiple voltages; other FETs can also be used, the principle is similar, only a slight adjustment .  2 . The DC stabilized power supply according to claim 1 , wherein the DC voltage stabilizing circuit is capable of sampling a voltage from the input AC mains and rectifying the rectifier through a rectifier and a sampling resistor. Stabilizing capacitor (this regulator capacitor can be connected in series with the rectifier bridge). It is added to the Zener diode, and has a sampling resistor and a voltage regulator capacitor to ensure that the voltage wave value added to the Zener diode is the minimum value equal to or greater than the voltage regulator. The voltage regulation value of the diode; then a stable voltage can be output through a voltage regulator capacitor (or not), and a variable resistor can be added to the output terminal to obtain an adjustable voltage. When multiple voltage outputs are required. Simply connect several sampling resistors in series or in parallel.  3. A DC stabilized power supply according to claim 1, wherein both of the above circuits are replaced by a diode half-wave rectification instead of a rectifier bridge, and the effect is as good.  4. A DC stabilized power supply according to claim 1, wherein the circuit is not required to be rectified in comparison with the above two cases:: sampling a voltage from the input AC mains with a fuse and a sampling resistor After half-wave rectification by a diode, _ can obtain a general-purpose DC voltage through an output capacitor; several output resistors can be connected in series and parallel to obtain multiple output voltages; a variable resistor can be added to the output terminal to obtain a Adjustable voltage.  5. A DC stabilized power supply according to claim 1. 2. 3. 4, characterized in that the above-mentioned several circuits are used as a charger, only one switch circuit is required, and components requiring heat dissipation are required only The copper plate of the printed circuit board is enlarged or the metal piece is placed in a place where heat is dissipated to save the fan; the sampling resistors at the input end can be placed behind the rectifier bridge, which only increases the requirements of the rectifier bridge; it is widely applicable to various rectifiers. The circuit, because of its simple circuit, can be directly integrated on various lines. It can be directly installed on various equipments as a charger, or it can be made into an integrated block.