Voltage Regulation Circuit

Abstract

The present invention discloses a voltage regulating circuit, comprising a first switch, a first voltage regulator diode, a first diode and a first resistor, wherein the drain of the first switch is connected to an input voltage, the gate and source of the first switch are connected in parallel with the first resistor, the gate of the first switch is connected to the cathode of the first voltage regulator diode, the anode of the voltage regulator diode is connected to the ground, the source of the first switch is connected to the anode of the first diode, and the cathode of the first diode outputs an output voltage. The output voltage output by the voltage regulating circuit of the present invention is stable, and the circuit efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy conversion, and in particular to a wide range voltage regulation circuit. Background Art

[0002] In new energy fields such as wind power generation and solar power generation, the input voltage range of the power supply is very wide, such as 0-500V, and the control chip in the power conversion device requires a very stable supply voltage. Therefore, an efficient and stable voltage regulation circuit is particularly important. Summary of the invention

[0003] The present invention is based on this and provides a voltage regulating circuit to realize automatic circuit regulation. It can achieve the circuit's voltage stabilization output without the need for an additional feedback circuit. The circuit has a simple structure and high efficiency.

[0004] Voltage regulation circuit, including,

[0005] a first switch, wherein a drain of the first switch is connected to an input voltage;

[0006] A first resistor is connected in parallel between the gate and the source of the first switch;

[0007] a first zener diode, wherein a cathode of the first zener diode is connected to a parallel end of the first resistor and a gate of the first switch, and an anode of the zener diode is connected to a ground terminal;

[0008] A first diode, wherein an anode of the first diode is connected to a parallel end of the first resistor and a source of the first switch, and a cathode of the voltage regulator diode is an output end of the voltage regulating circuit, and outputs an output voltage.

[0009] The state of the first switch is a normally closed switch. When the voltage difference between the gate and the source is greater than the gate turn-off voltage, the first switch is turned off.

[0010] The resistance value of the first resistor is not greater than a quotient obtained by dividing a difference between a voltage value of the output voltage and a voltage stabilization value of the voltage stabilizing diode by an operating current of the voltage stabilizing diode.

[0011] The voltage regulating circuit further includes a switch control unit, wherein the switch control unit includes:

[0012] a second resistor, one end of which receives a switch signal input;

[0013] a second voltage stabilizing diode, wherein the cathode of the second voltage stabilizing diode is connected to the other end of the second resistor,

[0014] a second switch, wherein the gate of the second switch is connected to the anode of the second voltage zener diode, and the second switch is connected in parallel to both ends of the first voltage zener diode,

[0015] a second diode, the second diode being connected in parallel between the gate and the collector of the second switch,

[0016] A third resistor is connected in parallel between the gate and the emitter of the second switch.

[0017] The switch control unit further includes a third diode, which is connected in series between a parallel connection point of the collector of the second switch and the anode of the first voltage regulator diode and a ground terminal.

[0018] When the first diode is turned on, the first switch operates in a linear conduction region.

[0019] The difference between the output voltage, the conduction voltage drop of the first diode, and the regulated voltage value of the first voltage regulator diode is between the turn-on voltage and the turn-off voltage of the first switch.

[0020] In the technical solution of the present invention, the first resistor is connected in parallel between the gate and source of the first switch to provide a current loop for the first voltage regulator diode. The voltage difference across the first resistor is small, and the loss of the first resistor is small, thereby improving the efficiency of the entire circuit. In addition, a switch control unit is provided to actively control the opening and closing of the voltage regulation circuit.

[0021] In order to make the above features and advantages of the invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the first specific embodiment of the voltage regulating circuit of the present invention.

[0023] Figure 2 This is the second specific embodiment of the voltage regulating circuit of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1As shown, in the first specific embodiment of the voltage regulation circuit of the present invention, the input voltage Vin is regulated by the switch Q1 and the diode D1 to become the output voltage Vcc, and the switch Q1 and the diode D1 are connected in series in the same direction. The switch Q1 is a normally closed switch, and the gate of the switch Q1 is connected to the ground through the voltage zener diode DZ1. A resistor R1 is connected in parallel between the gate and the source of the switch Q1. The resistor R1 ensures that the switch Q1 can be driven reliably and has strong anti-interference ability. The resistor R1 also provides a current path for the voltage zener diode DZ1. The voltage drop on the resistor R1 is small, which improves the operating efficiency of the entire circuit.

[0026] When the voltage value of the input voltage Vin is less than the conduction voltage of the diode D1, the diode D1 is cut off; when the voltage value of the input voltage Vin is greater than the conduction voltage of the diode D1, the diode D1 is turned on; when the voltage value of the input voltage Vin is greater than the voltage stabilization value of the voltage stabilizing diode DZ1, the switch Q1 enters the linear working area, a voltage drop is generated between the drain and source of the switch Q1, and the voltage value of the output voltage VCC is stabilized to be constant.

[0027] The resistance value of the resistor R1 is selected in a manner that the resistance value is not greater than the quotient obtained by dividing the difference between the voltage value of the output voltage and the voltage value of the voltage regulator diode by the working current of the voltage regulator diode. The voltage value of the voltage regulator diode DZ1 is selected according to the voltage value of the output voltage VCC. For example, if the voltage value of the output voltage VCC is 15V, then the voltage value of the voltage regulator diode DZ1 is approximately 15V minus the voltage drop across the diode D1 and the resistor R1.

[0028] like Figure 2 As shown, the second specific embodiment of the voltage regulation circuit of the present invention, the voltage regulation circuit further includes a switch control circuit 21, the switch control circuit 21 controls the switch Q1 to be turned off. The switch control circuit 21 includes a switch Q2, the gate of the switch Q2 is connected to the control signal Son through a resistor R2 and a voltage zener diode DZ2, a resistor R3 is connected in parallel between the gate and the emitter of the switch Q2, a diode D2 is connected in parallel between the gate and the collector of the switch Q2, the switch Q2 is connected in parallel to both ends of the voltage zener diode DZ1, the collector of the switch Q2 is connected to the cathode of the voltage zener diode DZ1, and the emitter of the switch Q2 is connected to the anode of the voltage zener diode. The emitter of the switch Q2 is connected to the anode of the voltage zener diode and then connected to the anode of the diode D3, and the cathode of the diode D3 is connected to the ground.

[0029] In this embodiment, the switch Q2 is preferably a PNP transistor. When the control signal Son is at a high level and is greater than the breakdown voltage of the voltage-stabilizing diode DZ2, the switch Q2 is turned off, and the diode D2 is turned on, thereby ensuring that the switch Q2 is reliably turned off. When the control signal Son is at a low level, the switch Q2 is turned on, the voltage-stabilizing diode DZ1 is short-circuited, and the gate of the switch Q1 is connected to the ground. As long as there is a voltage at the source of the switch Q1, the switch Q1 will be turned off, that is, the voltage regulation circuit is turned off.

[0030] The resistor R2 is a current limiting resistor, the resistor R3 ensures that the switch Q2 is reliably driven, and the diode D3 plays an anti-interference role.

[0031] The technical solution of the present invention can ensure the stability of the output voltage VCC, while the circuit loss is small, and the voltage adjustment circuit can be turned off by the control signal Son.

[0032] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A voltage regulating circuit, characterized in that: include, a first switch, wherein a drain of the first switch is connected to an input voltage; A first resistor is connected in parallel between the gate and the source of the first switch; a first zener diode, wherein a cathode of the first zener diode is connected to a parallel end of the first resistor and a gate of the first switch, and an anode of the zener diode is connected to a ground terminal; a first diode, wherein an anode of the first diode is connected to a parallel end of the first resistor and a source of the first switch, and a cathode of the voltage regulator diode is an output end of the voltage regulation circuit, outputting an output voltage; The state of the first switch is a normally closed switch, and when the voltage difference between the gate and the source is greater than the gate turn-off voltage, the first switch is turned off; Also included is a switch control unit, the switch control unit comprising: a second resistor, one end of which receives a control signal input, a second voltage stabilizing diode, wherein the cathode of the second voltage stabilizing diode is connected to the other end of the second resistor, a second switch, wherein the gate of the second switch is connected to the anode of the second voltage zener diode, and the second switch is connected in parallel to both ends of the first voltage zener diode, a second diode, the second diode being connected in parallel between the gate and the collector of the second switch, a third resistor, the third resistor being connected in parallel between the gate and the emitter of the second switch, A control signal is provided, wherein the control signal is connected to the gate of the second switch through the second resistor and the second voltage regulator diode. When the control signal is at a high level and is greater than the breakdown voltage of the second voltage regulator diode, the second switch is turned off, and the second diode is turned on at the same time, so as to ensure that the second switch is reliably turned off. When the control signal is at a low level, the second switch is turned on, the first voltage regulator diode is short-circuited, and the gate of the first switch is connected to the ground. As long as there is a voltage at the source of the first switch, the first switch will be turned off, and the voltage regulation circuit will be turned off.

2. The voltage regulating circuit according to claim 1, characterized in that: The resistance value of the first resistor is not greater than a quotient obtained by dividing a difference between a voltage value of the output voltage and a voltage stabilization value of the voltage stabilizing diode by an operating current of the voltage stabilizing diode.

3. The voltage regulating circuit according to claim 2, characterized in that: The device further includes a third diode, which is connected in series between a parallel connection point of the collector of the second switch and the anode of the first voltage regulator diode and a ground terminal.

4. The voltage regulating circuit according to claim 1, characterized in that: When the first diode is turned on, the first switch operates in a linear conduction region.

5. The voltage regulating circuit as claimed in claim 4, characterized in that: The difference between the output voltage, the conduction voltage drop of the first diode, and the regulated voltage value of the first voltage regulator diode is between the turn-on voltage and the turn-off voltage of the first switch.

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